Currently, if there are not enough rows to fill the height of RadGridView control, the pinned row will appear right after the last row. It will be good to facilitate customization that sets the pinned row to appear at the bottom of the grid. Same logic holds for summary rows and columns.

Workaround:

public Form1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    for (int i = 0; i < 5; i++)
    {
        dt.Rows.Add(i, "Item" + i);
    }

    this.radGridView1.DataSource = dt;
    this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;

    this.radGridView1.AllowSearchRow = true;
    this.radGridView1.SearchRowPosition = Telerik.WinControls.UI.SystemRowPosition.Bottom;

    this.radGridView1.ViewDefinition = new CustomTableViewDefition();
}

public class CustomTableViewDefition : TableViewDefinition
{
    public override IRowView CreateViewUIElement(GridViewInfo viewInfo)
    {
        return new CustomTableElement();
    }
}

public class CustomTableElement : GridTableElement
{
    protected override RowsContainerElement CreateViewElement()
    {
        return new CustomRowsContainerElement();
    }
}

public class CustomRowsContainerElement : RowsContainerElement
{
    protected override SizeF ArrangeOverride(SizeF finalSize)
    {
        float y = 0;

        this.TopPinnedRows.Arrange(new RectangleF(0, y, finalSize.Width, this.TopPinnedRows.DesiredSize.Height));
        y += this.TopPinnedRows.DesiredSize.Height + ElementSpacing;

        this.ScrollableRows.Arrange(new RectangleF(0, y, finalSize.Width, this.ScrollableRows.DesiredSize.Height));
        y += this.ScrollableRows.DesiredSize.Height + ElementSpacing;

        this.BottomPinnedRows.Arrange(new RectangleF(0, finalSize.Height - this.BottomPinnedRows.DesiredSize.Height,
            finalSize.Width, this.BottomPinnedRows.DesiredSize.Height));

        return finalSize;
    }
}

To reproduce:
DataTable table;
public RadForm1()
{
    InitializeComponent();
    table = GetTable();
    radGridView1.DataSource = table;

}

private void radButton1_Click(object sender, EventArgs e)
{
    var changes = table.GetChanges();

    if (changes == null)
    {
        Console.WriteLine("No Changes");
    }
    else
    {
        Console.WriteLine("Saved");

        foreach (DataRow item in changes.Rows) 
        {
            Console.WriteLine(item.RowState.ToString());
        }
    }

    table.AcceptChanges();
}
static DataTable GetTable()
{

    DataTable table = new DataTable();
    table.Columns.Add("Dosage", typeof(int));
    table.Columns.Add("Drug", typeof(string));
    table.Columns.Add("Name", typeof(string));
    table.Columns.Add("Date", typeof(DateTime));


    table.Rows.Add(25, "Indocin", "David", DateTime.Now);
    table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
    table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
    table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
    table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
    table.AcceptChanges();

    return table;
}

Workaround:
(this.radGridView1.CurrentRow.DataBoundItem as IEditableObject).EndEdit();

To reproduce:

private void Form1_Load(object sender, EventArgs e)
{
    this.order_DetailsTableAdapter.Fill(this.nwindDataSet.Order_Details);

    this.radGridView1.DataSource = this.orderDetailsBindingSource;
    this.radGridView1.EnablePaging = true;
    this.radGridView1.AutoSizeRows = true;
}

private void radButton1_Click(object sender, EventArgs e)
{
    this.radGridView1.PrintStyle.PrintAllPages = true;
    this.radGridView1.PrintPreview();
} 

Workaround:  refresh the MasterTemplate after the PrintPreview dialog is closed: 

this.radGridView1.PrintPreview();

this.radGridView1.MasterTemplate.Refresh();

To reproduce:

public RadForm1()
{
    InitializeComponent();
    DataTable dt = new DataTable();
    for (int i = 0; i < 10; i++)
    {
        dt.Columns.Add("Col" + i);
    }

    for (int i = 0; i < 50; i++)
    {
        DataRow dr = dt.NewRow();
        foreach (DataColumn col in dt.Columns)
        {
            dr[col.ColumnName] = "Data." + i + "." + dt.Columns.IndexOf(col);
        }
        dt.Rows.Add(dr);
    }

    this.radGridView1.DataSource = dt;
    this.radGridView1.MasterTemplate.EnablePaging = true;
    this.radGridView1.MasterTemplate.ShowGroupedColumns = true;
}

public void ExportContactToExcelFile(string strFileName)
{
    GridViewSpreadExport spreadExporter = new GridViewSpreadExport(this.radGridView1);
    SpreadExportRenderer exportRenderer = new SpreadExportRenderer();
       
    spreadExporter.PagingExportOption = PagingExportOption.AllPages;
    spreadExporter.ExportVisualSettings = true;
    spreadExporter.SheetName = "Contacts";
    spreadExporter.RunExport(strFileName, exportRenderer);
}

private void radButton1_Click(object sender, EventArgs e)
{
    ExportContactToExcelFile(@"..\..\Export" + DateTime.Now.ToLongTimeString().Replace(":", "_") + ".xlsx");
}
 
Workaround: refresh the MasterTemplate after the export:

private void radButton1_Click(object sender, EventArgs e)
{
    ExportContactToExcelFile(@"..\..\Export" + DateTime.Now.ToLongTimeString().Replace(":", "_") + ".xlsx");
    this.radGridView1.MasterTemplate.Refresh();
}

Workaround: skip the summary rows by creating custom GridViewSearchRowInfo:  

private void radGridView1_CreateRowInfo(object sender, GridViewCreateRowInfoEventArgs e)
{
    if (e.RowInfo is GridViewSearchRowInfo)
    {
        e.RowInfo = new CustomGridViewSearchRowInfo(e.ViewInfo);
    }
}


public class CustomGridViewSearchRowInfo : GridViewSearchRowInfo
        {
            public CustomGridViewSearchRowInfo(GridViewInfo viewInfo) : base(viewInfo)
            {
            }

            protected override bool MatchesSearchCriteria(string searchCriteria, GridViewRowInfo row, GridViewColumn col)
            {
                if (row is GridViewSummaryRowInfo)
                {
                    return false;
                }
                return base.MatchesSearchCriteria(searchCriteria, row, col);
            }
        }

Workaround: 

 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            this.radGridView1.DataSource = this.GetData();
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

            ((GridViewDateTimeColumn)this.radGridView1.Columns["Date"]).FormatString = "{0: yyyy-MM-dd hh:mm:ss.fff tt}";
        }

        private DataTable GetData()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Id", typeof(int));
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Date", typeof(DateTime));
            dt.Columns.Add("Bool", typeof(bool));
            for (int i = 0; i < 100; i++)
            {
                dt.Rows.Add(i, "Name " + i, DateTime.Now.AddDays(i), i % 2 == 0);
            }

            return dt;
        }
    }

 public class MyRadGridView : RadGridView
    {
        public override string ThemeClassName
        {
            get
            {
                return typeof(RadGridView).FullName;
            }
        }

        protected override RadGridViewElement CreateGridViewElement()
        {
            return new MyRadGridViewElement();
        }
    }

 public class MyRadGridViewElement : RadGridViewElement
    {
        protected override Type ThemeEffectiveType
        {
            get
            {
                return typeof(MyRadGridViewElement);
            }
        }

        protected override MasterGridViewTemplate CreateTemplate()
        {
            return new MyMasterGridViewTemplate();
        }
    }

 public class MyMasterGridViewTemplate : MasterGridViewTemplate
    {
        public override void Copy()
        {
            base.Copy();

            GridViewCellInfo[] cells = null;
            if (this.SelectionMode == GridViewSelectionMode.CellSelect)
            {
                cells = new GridViewCellInfo[this.SelectedCells.Count];
                this.SelectedCells.CopyTo(cells, 0);
            }
            else if (this.SelectionMode == GridViewSelectionMode.FullRowSelect)
            {
                GridViewDataRowInfo row = this.SelectedRows[0] as GridViewDataRowInfo;
                if (this.SelectedRows.Count == 1 && row.ViewTemplate.CurrentColumn != null)
                {
                    cells = new GridViewCellInfo[row.Cells.Count];
                    for (int i = 0; i < row.Cells.Count; i++)
                    {
                        cells[i] = row.Cells[i];
                    }
                }
            }

            if (Clipboard.GetData(DataFormats.Text) != null)
            {
                string data = Clipboard.GetData(DataFormats.Text).ToString();
                if (data != string.Empty && cells != null)
                {
                    var values = data.Split(new char[] { '\t' }, StringSplitOptions.RemoveEmptyEntries);

                    StringBuilder sb = new StringBuilder();
                    foreach (string value in values)
                    {
                        DateTime date;
                        if (DateTime.TryParse(value, out date))
                        {
                            string baseFormat = "yyyy-MM-dd HH:mm tt";
                            foreach (var cell in cells)
                            {
                                if (cell.ColumnInfo is GridViewDateTimeColumn && ((DateTime)cell.Value).ToString(baseFormat) == date.ToString(baseFormat))
                                {
                                    sb.Append(string.Format(((GridViewDateTimeColumn)cell.ColumnInfo).FormatString, cell.Value) + "\t");
                                    break;
                                }
                            }
                        }
                        else
                        {
                            sb.Append(value + "\t");
                        }
                    }

                    Clipboard.Clear();
                    Clipboard.SetData(DataFormats.Text, sb.ToString());
                }
            }
        }
    }

To reproduce: follow the steps illustrated in the attached gif file.

Please refer to the attached screenshot.

To reproduce:

public Form1()
{
    InitializeComponent(); 

    DataTable dt = new DataTable();
    dt.Columns.Add("Id", typeof(int));
    dt.Columns.Add("Name", typeof(string));

    for (int i = 0; i < 5; i++)
    {
        dt.Rows.Add(i, "Item" + i);
    }

    Random rand = new Random();
    DataTable dt2 = new DataTable();
    dt2.Columns.Add("Id", typeof(int));
    dt2.Columns.Add("Name2", typeof(string));
    dt2.Columns.Add("ParentId", typeof(int));
    for (int i = 0; i < 20; i++)
    {
        dt2.Rows.Add(i, "Child Item" + i, rand.Next(0, 5));
    }

    radGridView1.DataSource = dt;
    radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
    GridViewTemplate template = new GridViewTemplate();
    template.DataSource = dt2;
    template.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
    radGridView1.MasterTemplate.Templates.Add(template);
    template.Columns["ParentId"].IsVisible = false;

    GridViewRelation relation = new GridViewRelation(radGridView1.MasterTemplate);
    relation.ChildTemplate = template;
    relation.RelationName = "MasterDetail";
    relation.ParentColumnNames.Add("Id");
    relation.ChildColumnNames.Add("ParentId");
    radGridView1.Relations.Add(relation);

    this.radGridView1.EnableFiltering = true;
    this.radGridView1.ShowFilteringRow = false;
    this.radGridView1.ShowHeaderCellButtons = true;
}

Workaround: change the Name property of the column in order to avoid duplicated columns: 

template.Columns["Name"].Name = "Name2";

To reproduce: please refer to the attached gif file demonstrating how to reproduce the issue with the Demo application.

Workaround: use the basic filtering.

Repeat the master template headers right after the end of an expanded detail template. The purpose is clarity for the end user.

To reproduce:

public Form1()
{
    InitializeComponent();
    List<Item> items = new List<Item>();
    for (int i = 0; i < 10; i++)
    {
        items.Add(new Item(i,"Item" + i,Color.Red));
    }
    this.radGridView1.DataSource = items;
    this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
    this.radGridView1.CellValidating += radGridView1_CellValidating;
}

private void radGridView1_CellValidating(object sender, Telerik.WinControls.UI.CellValidatingEventArgs e)
{
    if (e.ActiveEditor != null && e.ActiveEditor is GridColorPickerEditor)
    {
        Color c = (Color)e.Value;
        if (c == Color.Red)
        {
            e.Cancel = true;
            Console.WriteLine("Red is not allowed!");
        }
    }
}

public class Item
{
    public int Id { get; set; }

    public string Name { get; set; }

    public Color Color { get; set; }

    public Item(int id, string name, Color color)
    {
        this.Id = id;
        this.Name = name;
        this.Color = color;
    }
}

Steps:
1. Activate the editor for the Color cell.
2. Leave the color as it
3. Press the Enter key. The CellValidating event is fired twice.

Note: it seems that when the color text is selected, the event is fired twice.

Please refer to the attached screenshot.

Workaround:

public Form1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    for (int i = 0; i < 5; i++)
    {
        dt.Rows.Add(i, "Item" + i);
    }

    this.radGridView1.DataSource = dt;
    this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;

    this.radGridView1.AllowSearchRow = true;
    this.radGridView1.SearchRowPosition = Telerik.WinControls.UI.SystemRowPosition.Bottom;

    this.radGridView1.ViewDefinition = new CustomTableViewDefition();
}

public class CustomTableViewDefition : TableViewDefinition
{
    public override IRowView CreateViewUIElement(GridViewInfo viewInfo)
    {
        return new CustomTableElement();
    }
}

public class CustomTableElement : GridTableElement
{
    protected override RowsContainerElement CreateViewElement()
    {
        return new CustomRowsContainerElement();
    }
}

public class CustomRowsContainerElement : RowsContainerElement
{
    protected override SizeF ArrangeOverride(SizeF finalSize)
    {
        float y = 0;

        this.TopPinnedRows.Arrange(new RectangleF(0, y, finalSize.Width, this.TopPinnedRows.DesiredSize.Height));
        y += this.TopPinnedRows.DesiredSize.Height + ElementSpacing;

        this.ScrollableRows.Arrange(new RectangleF(0, y, finalSize.Width, this.ScrollableRows.DesiredSize.Height));
        y += this.ScrollableRows.DesiredSize.Height + ElementSpacing;

        this.BottomPinnedRows.Arrange(new RectangleF(0, finalSize.Height - this.BottomPinnedRows.DesiredSize.Height,
            finalSize.Width, this.BottomPinnedRows.DesiredSize.Height));

        return finalSize;
    }
}

To reproduce:

public Form1()
{
    InitializeComponent();

    GridViewComboBoxColumn comboCol = new GridViewComboBoxColumn();         
    comboCol.DataSource = InitComboActive();
    comboCol.ValueMember = "ActiveCode";
    comboCol.DisplayMember = "ActiveDsc";
    comboCol.FieldName = "ActiveCode";

    this.radGridView1.Columns.Add(comboCol);

    this.radGridView1.AutoGenerateColumns = false;
    BindRadGrid();
    this.radGridView1.CellValueChanged += radGridView1_CellValueChanged;
}

private void radGridView1_CellValueChanged(object sender, GridViewCellEventArgs e)
{
    BindRadGrid();
}

private void BindRadGrid()
{
    this.radGridView1.DataSource = null;
    this.radGridView1.DataSource = InitComboData();
}

private DataTable InitComboActive()
{
    DataTable dt = new DataTable("DtActive");
    dt.Columns.Add("ActiveCode");
    dt.Columns.Add("ActiveDsc");

    dt.Rows.Add("0", "InActive");
    dt.Rows.Add("1", "Active");

    return dt;
}

private DataTable InitComboData()
{
    DataTable dt = new DataTable("DtData");
    dt.Columns.Add("Host");
    dt.Columns.Add("ActiveCode");
    dt.Columns.Add("ActiveDsc");
    
    dt.Rows.Add("Host A", "0", "InActive");
    dt.Rows.Add("Host B", "1", "Active");

    return dt;
}

Workaround: use the RadGridView.CellEndEdit instead for rebinding. 
Workaround 2: use the CellValidated event:
private void radGridView1_CellValidated(object sender, CellValidatedEventArgs e)
{
    if (e.Row is GridViewDataRowInfo)
    {
        BindRadGrid();
    }
}

When you export ht grid content to HTML, the exported table contains an 'width' attribute set to 0. It is not possible to change this attribute. This prevents the HTML to be loaded correctly in RadRichTextEditor later.

To reproduce:

 public RadForm1()
 {
     InitializeComponent();
     
     DataTable master = new DataTable();
     master.Columns.Add("ID", typeof(int));
     master.Columns.Add("test", typeof(string));
     
     for (int i = 0; i < 500; i++)
     {
         master.Rows.Add(i, "Row " + i);
     }

     radGridView1.DataSource = master;

     radLabel1.Text = "RadGridView: AutoSizeRows = " + ((radGridView1.AutoSizeRows) ? "True" : "False");
 }

 private void radButton1_Click(object sender, EventArgs e)
 {
     radGridView1.TableElement.ScrollToRow(radGridView1.MasterTemplate.Rows[200]);
 }

 private void radButton2_Click(object sender, EventArgs e)
 {
     radGridView1.AutoSizeRows = !radGridView1.AutoSizeRows;

     radLabel1.Text = "RadGridView: AutoSizeRows = " + ((radGridView1.AutoSizeRows) ? "True" : "False");
 }


Workaround:

this.radGridView1.ViewDefinition = new CustomTableViewDefinition();


        public class CustomTableViewDefinition : TableViewDefinition
        {
            public override IRowView CreateViewUIElement(GridViewInfo viewInfo)
            {
                return new CustomGridTableElement();
            }
        }

        public class CustomGridTableElement : GridTableElement
        {
              protected override Type ThemeEffectiveType     
                 { 
                    get    
                              { 
                                     return typeof(GridTableElement);     
                               }
                   }
            public override void ScrollToRow(GridViewRowInfo rowInfo)
            {
                if (rowInfo == null || rowInfo.IsPinned || !rowInfo.IsVisible || rowInfo is GridViewDetailsRowInfo)
                {
                    return;
                }

                this.ViewElement.InvalidateMeasure();
                this.ViewElement.UpdateLayout();

                if (GridViewElement.AutoSizeRows || (ViewTemplate.Templates.Count > 0 && rowInfo.ViewTemplate.Parent != null))
                {
                    ScrollToRowCore(rowInfo, false);

                    return;
                }

                this.RowScroller.ScrollToItem(rowInfo, false);
                this.UpdateLayout();
            }

            private void ScrollToRowCore(GridViewRowInfo rowInfo, bool ensureVisible)
            {
                if (!this.GridViewElement.UseScrollbarsInHierarchy && this.ViewInfo.ParentRow != null)
                {
                    if (ensureVisible)
                    {
                        this.GridViewElement.TableElement.EnsureRowVisible(rowInfo);
                    }
                    else
                    {
                        this.GridViewElement.TableElement.ScrollToRow(rowInfo);
                    }
                    return;
                }

                if (!this.IsInValidState(true) || this.VScrollBar.LargeChange == 0)
                {
                    return;
                }

                RadControl control = this.ElementTree.Control as RadControl;
                if (control != null)
                {
                    control.SuspendUpdate();
                }

                int oldValue = this.VScrollBar.Value;
                GridRowElement rowElement = GetChildRowElement(rowInfo);
                
                if (rowElement == null && this.PageViewMode == PageViewMode.ExplorerBar)
                {
                    if (control != null)
                    {
                        control.ResumeUpdate();
                    }

                    return;
                }

                while (this.VScrollBar.Value < this.VScrollBar.Maximum)
                {
                    if (rowElement == null)
                    {
                        rowElement = GetChildRowElement(rowInfo);
                    }
                    if (rowElement != null)
                    {
                        ScrollToPartiallyVisibleRow(rowElement, ensureVisible);
                        break;
                    }
                    else
                    {
                        bool scrollRangeChanged = SetScrollValue(this.VScrollBar, this.VScrollBar.Value + this.VScrollBar.SmallChange);
                        if (this.VScrollBar.Value >= this.VScrollBar.Maximum - this.VScrollBar.LargeChange + 1 && !scrollRangeChanged)
                        {
                            SetScrollValue(this.VScrollBar, oldValue);
                            break;
                        }
                    }
                }

                if (oldValue == this.VScrollBar.Minimum || rowElement != null)
                {
                    if (control != null)
                    {
                        control.ResumeUpdate();
                    }
                    return;
                }

                SetScrollValue(this.VScrollBar, 0);

                while (this.VScrollBar.Value < oldValue)
                {
                    if (rowElement == null)
                    {
                        rowElement = GetChildRowElement(rowInfo);
                    }
                    if (rowElement != null)
                    {
                        ScrollToPartiallyVisibleRow(rowElement, ensureVisible);
                        break;
                    }
                    else
                    {
                        bool scrollRangeChanged = SetScrollValue(this.VScrollBar, this.VScrollBar.Value + this.VScrollBar.SmallChange);
                        if (this.VScrollBar.Value >= this.VScrollBar.Maximum - this.VScrollBar.LargeChange + 1 && !scrollRangeChanged)
                        {
                            SetScrollValue(this.VScrollBar, oldValue);
                            break;
                        }
                    }
                }

                if (control != null)
                {
                    control.ResumeUpdate();
                }
            }

            private GridRowElement GetChildRowElement(GridViewRowInfo rowInfo)
            {
                if (rowInfo.ViewInfo == this.ViewInfo)
                {
                    return GetRowElement(rowInfo);
                }
                else
                {
                    GridTableElement tableElement = GridViewElement.GetRowView(rowInfo.ViewInfo) as GridTableElement;
                    if (tableElement != null)
                    {
                        return tableElement.GetRowElement(rowInfo);
                    }
                }
                return null;
            }

            private void ScrollToPartiallyVisibleRow(GridRowElement rowElement, bool ensureVisible)
            {
                int delta = 0;

                while ((rowElement.ControlBoundingRectangle.Y < ViewElement.ScrollableRows.ControlBoundingRectangle.Y &&
                        rowElement.ControlBoundingRectangle.Bottom > ViewElement.ScrollableRows.ControlBoundingRectangle.Y) ||
                       (rowElement.ControlBoundingRectangle.Y < ViewElement.ScrollableRows.ControlBoundingRectangle.Bottom &&
                        rowElement.ControlBoundingRectangle.Bottom > ViewElement.ScrollableRows.ControlBoundingRectangle.Bottom))
                {
                    if (rowElement.ControlBoundingRectangle.Y < ViewElement.ScrollableRows.ControlBoundingRectangle.Y &&
                        rowElement.ControlBoundingRectangle.Bottom > ViewElement.ScrollableRows.ControlBoundingRectangle.Y)
                    {
                        delta = ViewElement.ScrollableRows.ControlBoundingRectangle.Y - rowElement.ControlBoundingRectangle.Y;
                        SetScrollValue(this.VScrollBar, this.VScrollBar.Value - delta);

                        return;
                    }

                    if (rowElement.ControlBoundingRectangle.Y < ViewElement.ScrollableRows.ControlBoundingRectangle.Bottom &&
                        rowElement.ControlBoundingRectangle.Bottom > ViewElement.ScrollableRows.ControlBoundingRectangle.Bottom)
                    {
                        delta = rowElement.ControlBoundingRectangle.Top - ViewElement.ScrollableRows.ControlBoundingRectangle.Top;
                        SetScrollValue(this.VScrollBar, this.VScrollBar.Value + delta);

                        return;
                    }

                    if (ensureVisible)
                    {
                        delta = rowElement.ControlBoundingRectangle.Bottom - ViewElement.ScrollableRows.ControlBoundingRectangle.Bottom;

                        if (delta < 0)
                        {
                            break;
                        }
                    }
                    else
                    {
                        delta = rowElement.ControlBoundingRectangle.Y - ViewElement.ScrollableRows.ControlBoundingRectangle.Y;

                        if (delta < 0)
                        {
                            delta = 0;
                        }
                    }

                    bool scrollRangeChanged = SetScrollValue(this.VScrollBar, this.VScrollBar.Value + delta);

                    if (this.VScrollBar.Value >= this.VScrollBar.Maximum - this.VScrollBar.LargeChange + 1 || !scrollRangeChanged)
                    {
                        break;
                    }
                }
            }
            
            private bool SetScrollValue(RadScrollBarElement scrollbar, int newValue)
            {
                int max = this.VScrollBar.Maximum;

                if (newValue > scrollbar.Maximum - scrollbar.LargeChange + 1)
                {
                    newValue = scrollbar.Maximum - scrollbar.LargeChange + 1;
                }

                if (newValue < scrollbar.Minimum)
                {
                    newValue = scrollbar.Minimum;
                }

                scrollbar.Value = newValue;
                this.UpdateLayout();

                return max != this.VScrollBar.Maximum;
            }
        }
  

Introduce a property to change symbol used to separate summaryItems in SummaryRowGroupHeaders.

To reproduce:
- Bind the grid to progress binding source at design time. 
- Locate GroupDescriptors in Properties and click the ellipsis button to open the GroupDescriptor Collection Editor.
- Click Add and select the new item.
- Select the GroupNames collection to open the SortDescriptor Collection Editor.
- Click Add.
- An exception is thrown and the UI freezes.

Workaround:
Add descriptors at runime.

To reproduce:
- Assing context menu using one of the default properties.

To reproduce:

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load 
    Me.ProductsTableAdapter.Fill(Me.NwindDataSet.Products) 
    Me.CategoriesTableAdapter.Fill(Me.NwindDataSet.Categories)

    Me.ProductsTableAdapter.Fill(Me.NwindDataSet.Products)
    Me.CategoriesTableAdapter.Fill(Me.NwindDataSet.Categories)
    RadGridView1.AutoGenerateHierarchy = True
    RadGridView1.DataSource = Me.NwindDataSet
    RadGridView1.DataMember = "Categories"
End Sub

Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
    Dim style As New GridPrintStyle()
    style.PrintHierarchy = True
    style.HierarchyIndent = 20
    style.ChildViewPrintMode = ChildViewPrintMode.SelectViewToPrint
    Me.RadGridView1.PrintStyle = style
    Me.RadGridView1.PrintPreview()
End Sub

Please refer to the attached gif file.

Workaround:

Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click

    Me.RadGridView1.PrintSettingsDialogFactory = New CustomGridViewPrintSettingsDialogFactory()

    Dim style As New GridPrintStyle()
    style.PrintHierarchy = True
    style.HierarchyIndent = 20
    style.ChildViewPrintMode = ChildViewPrintMode.SelectViewToPrint
    Me.RadGridView1.PrintStyle = style
    Me.RadGridView1.PrintPreview()
End Sub

Public Class CustomGridViewPrintSettingsDialog
Inherits GridViewPrintSettingsDialog 

    Sub New(document As RadPrintDocument)
        MyBase.New(document)
    End Sub
     
    Protected Overrides Sub LoadSettings()
        MyBase.LoadSettings()

        Dim gridView As RadGridView = TryCast(Me.PrintDocument.AssociatedObject, RadGridView)
        Me.printStyleSettingControl.PrintStyle.PrintHierarchy =gridView.PrintStyle.PrintHierarchy 
    End Sub
End Class

Public Class CustomGridViewPrintSettingsDialogFactory
    Implements IPrintSettingsDialogFactory

    Public Function CreateDialog(document As RadPrintDocument) As Form Implements IPrintSettingsDialogFactory.CreateDialog
        Return New CustomGridViewPrintSettingsDialog(document)
    End Function
End Class