When you use a custom GroupComparer for the MasterTemplate, grouping is performed successfully for the first time. However, if you remove all groups and perform grouping again for the same columns, the grid behavior is not as expected: you will notice groups mismatching or duplication. Here is a sample code snippet which incorrect behavior is illustrated on the attached gif file:

public Form1()
{
    InitializeComponent();

    DataTable dt = new DataTable();
    dt.Columns.Add("Reference");
    dt.Columns.Add("Test Case");
    dt.Columns.Add("ChBW");
    dt.Columns.Add("Voltage");
    dt.Columns.Add("Environmental Conditions");
    dt.Columns.Add("RadioAccessTechnology");

    dt.Rows.Add("4.2.1", "E-Utran FDD...", "10", "C Nominal-2", "T Nominal - V Nominal", "E-UTRAN Only");
    dt.Rows.Add("5.2.1", "E-Utran FDD...", "3", "C Nominal-1", "T Nominal - V Nominal", "E-UTRAN Only");
    dt.Rows.Add("14.2.1", "E-Utran FDD...", "1", "C Nominal-3", "T Nominal - V Nominal", "E-UTRAN Only");
    dt.Rows.Add("2.2.1", "E-Utran FDD...", "4", "C Nominal-2", "T Nominal - V Nominal", "E-UTRAN Only");
    dt.Rows.Add("7.2.1", "E-Utran FDD...", "12", "C Nominal-1", "T Nominal - V Nominal", "E-UTRAN Only");
    dt.Rows.Add("2.2.1", "E-Utran FDD...", "2", "C Nominal-3", "T Nominal - V Nominal", "E-UTRAN Only");

    this.radGridControlSelection.DataSource = dt;
    this.radGridControlSelection.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

    this.radGridControlSelection.MasterTemplate.GroupComparer = new GroupComparer();
}

public class GroupComparer : IComparer<Group<GridViewRowInfo>>
{
    public int Compare(Group<GridViewRowInfo> x, Group<GridViewRowInfo> y)
    {
        if (x.Level != y.Level)
        {
        }
        DataGroup group = x as DataGroup;

        var a = x.Header;
        var b = y.Header;

        int valueA;
        int valueB;

        if (group == null)
        {
            group = y as DataGroup;
        }
        if (group != null && group.GroupDescriptor != null && group.GroupDescriptor.GroupNames.Count > 0)
        {
            string propertyName = group.GroupDescriptor.GroupNames.First().PropertyName;
            if ((propertyName.ToUpper() == "VOLTAGE"))
            {
                int indexA = GetIndexContain(a.ToString().Split(new char[] { '-' })[1]);
                int indexB = GetIndexContain(b.ToString().Split(new char[] { '-' })[1]);

                if (indexA == indexB)
                {
                    return 0;
                }
                else if (indexA < indexB)
                {
                    return -1;
                }
                else
                {
                    return 1;
                }
            }
            else if (propertyName.ToUpper() == "RADIOACCESSTECHNOLOGY")
            {
                return x.Key.ToString().CompareTo(y.Key.ToString());
            }
            // BAND
            else if (propertyName.ToUpper() == "CHBW")
            {
                Int32.TryParse(a, out valueA);
                Int32.TryParse(b, out valueB);

                //ASCENDING SELECTED
                if (group.GroupDescriptor.GroupNames.First().Direction == ListSortDirection.Ascending)
                {
                    if (valueA > valueB)
                    {
                        return 1;
                    }
                    else if (valueA < valueB)
                    {
                        return -1;
                    }
                    else
                    {
                        return 0;
                    }
                }
                //DESCENDING
                else
                {
                    if (valueA > valueB)
                    {
                        return -1;
                    }
                    else if (valueA < valueB)
                    {
                        return 1;
                    }
                    else
                    {
                        return 0;
                    }
                }
            }
        }
        return x.Key.ToString().CompareTo(y.Key.ToString());
    }

    private int GetIndexContain(string a)
    {
        int parsedValue;
        if (int.TryParse(a, out parsedValue))
        {
            return 10 - parsedValue;
        }
        return -1;
    }
}


Workaround:

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

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

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

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

public class CustomMasterGridViewTemplate : MasterGridViewTemplate
{
    protected override GridViewListSource CreateListSource()
    {
        return new CustomGridViewListSource(this);
    }
}

public class CustomGridViewListSource : GridViewListSource
{
    public CustomGridViewListSource(GridViewTemplate template) : base(template)
    {
    }

    protected override RadCollectionView<GridViewRowInfo> CreateDefaultCollectionView()
    {
        return new CustomGridDataView(this);
    }
}

public class CustomGridDataView : GridDataView
{
    public CustomGridDataView(GridViewListSource listSource) : base(listSource)
    {
    }

    protected override GroupBuilder<GridViewRowInfo> CreateGroupBuilder()
    {
        return new CustomGroupBuilder(this.Indexer);
    }
}

public class CustomGroupBuilder : GridGroupBuilder
{
    public CustomGroupBuilder(Index<GridViewRowInfo> index) : base(index)
    {
    }

    protected override Group<GridViewRowInfo> GetGroup(GroupCollection<GridViewRowInfo> cache,
        Group<GridViewRowInfo> newGroup, Group<GridViewRowInfo> parent, object key, int level)
    {
        GroupDescriptor currentDescriptor = this.CollectionView.GroupDescriptors[level];
        DataGroup group = (DataGroup)base.GetGroup(null, newGroup, parent, key, level);
        if (group.GroupDescriptor != null && group.GroupDescriptor != currentDescriptor)
        {
            SetGroupDescriptor(group, null);
            IGroupFactory<GridViewRowInfo> groupFactory = this.CollectionView.GroupFactory;
            group = (DataGroup)groupFactory.CreateGroup(key, parent);
            group.GroupBuilder = this;
        }
        SetGroupDescriptor(group, currentDescriptor);
        return group;
    }

    private void SetGroupDescriptor(DataGroup dataGroup, GroupDescriptor currentDescriptor)
    {
        FieldInfo fi = typeof(DataGroup).GetField("groupDescriptor", BindingFlags.NonPublic | BindingFlags.Instance);
        fi.SetValue(dataGroup, currentDescriptor);
    }
}

To reproduce:
            string fileName = @"..\..\..\exported" + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second + ".xlsx";
            SpreadExport spreadExporter = new SpreadExport(radGridView1);
            spreadExporter.ExportVisualSettings = false;      
            spreadExporter.RunExport(fileName);


Workaround:
spreadExporter.WorkbookCreated += spreadExporter_WorkbookCreated;
private void spreadExporter_WorkbookCreated(object sender, WorkbookCreatedEventArgs e)
{

    Telerik.Windows.Documents.Spreadsheet.PropertySystem.CellStyle defaultStyle = e.Workbook.Styles.Add("DefaultStyle");
    defaultStyle.FontSize = Telerik.Windows.Documents.Spreadsheet.Utilities.UnitHelper.PointToDip(11);
    Telerik.Windows.Documents.Spreadsheet.Model.Worksheet sheet = e.Workbook.Worksheets.First();
    sheet.Cells[0, 0, sheet.UsedCellRange.RowCount, sheet.UsedCellRange.ColumnCount].SetStyleName("DefaultStyle");
    sheet.Columns[sheet.UsedCellRange].AutoFitWidth();
}

To reproduce:
 this.radGridView1.MultiSelect = true;

Please refer to the attached gif file illustrating better the behavior.

1. Select a row and filter the grid in a way to keep the selected row visible.
2. The first row in the ChildRows collection is selected.
3. Clear the filter. The selection is stored and only one row is selected.
4. Repeat the above steps, but perform such filtering that hides the selected cell. When you clear the filter, two rows are selected instead of one.

Workaround:
private void radGridView1_FilterChanged(object sender, Telerik.WinControls.UI.GridViewCollectionChangedEventArgs e)
        {
            this.radGridView1.ClearSelection();
            if (this.radGridView1.CurrentCell!=null)
            {
                this.radGridView1.CurrentCell.IsSelected = true;
                this.radGridView1.CurrentRow.IsSelected = true;
                this.radGridView1.GridNavigator.Select(this.radGridView1.CurrentRow, this.radGridView1.CurrentColumn);
            }
        }

Currently, when you have an object which has more than one parent, the grid falls in an invalid state and shows the child under all of the parents, however, it does not behave correctly. As this is not supported scenario, the user should be notified via exception.

Workaround:

Subscribe  to CellFormatting event:

void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement is GridCheckBoxCellElement)
    {
        e.CellElement.ToolTipText = "ErrorMessage for CheckBoxColumn";
        e.CellElement.Children[0].ToolTipText = "ErrorMessage for CheckBoxColumn";
        e.CellElement.Children[0].Children[0].ToolTipText = "ErrorMessage for CheckBoxColumn";
    }
}

To reproduce: use the following code snippet and follow the steps illustrated on the attached gif file:

private void Form1_Load(object sender, EventArgs e)
{
    this.customersTableAdapter.Fill(this.nwindDataSet.Customers);
    this.radGridView1.DataSource = this.customersBindingSource;
    this.radGridView1.BestFitColumns(BestFitColumnMode.AllCells);
    ColumnGroupsViewDefinition view = new ColumnGroupsViewDefinition();
    view.ColumnGroups.Add(new GridViewColumnGroup("Customer Contact"));
    view.ColumnGroups.Add(new GridViewColumnGroup("Details"));
    view.ColumnGroups[1].Groups.Add(new GridViewColumnGroup("Address"));
    view.ColumnGroups[1].Groups.Add(new GridViewColumnGroup("Contact"));
    view.ColumnGroups[0].Rows.Add(new GridViewColumnGroupRow());
    view.ColumnGroups[0].Rows[0].Columns.Add(this.radGridView1.Columns["CompanyName"]);
    view.ColumnGroups[0].Rows[0].Columns.Add(this.radGridView1.Columns["ContactName"]);
    view.ColumnGroups[0].Rows[0].Columns.Add(this.radGridView1.Columns["ContactTitle"]);

    view.ColumnGroups[1].Groups[0].Rows.Add(new GridViewColumnGroupRow());
    view.ColumnGroups[1].Groups[0].Rows[0].Columns.Add(this.radGridView1.Columns["Address"]);
    view.ColumnGroups[1].Groups[0].Rows[0].Columns.Add(this.radGridView1.Columns["City"]);
    view.ColumnGroups[1].Groups[0].Rows[0].Columns.Add(this.radGridView1.Columns["Country"]);

    view.ColumnGroups[1].Groups[1].Rows.Add(new GridViewColumnGroupRow());
    view.ColumnGroups[1].Groups[1].Rows[0].Columns.Add(this.radGridView1.Columns["Phone"]);
    view.ColumnGroups[1].Groups[1].Rows[0].Columns.Add(this.radGridView1.Columns["Fax"]);
    radGridView1.ViewDefinition = view;
}

Sometimes the incorrect behavior is obtained immediately after you drop the column, but you need to scroll the horizontal scroll-bar to replicate it.

Workaround:
RadGridViewDragDropService svc = this.radGridView1.GridViewElement.GetService<RadGridViewDragDropService>();
svc.Stopped += svc_Stopped;

private void svc_Stopped(object sender, EventArgs e)
{
    int horizontalScrollvalue = this.radGridView1.TableElement.HScrollBar.Value;
    this.radGridView1.MasterTemplate.Refresh();
    this.radGridView1.TableElement.HScrollBar.Value = horizontalScrollvalue;
}

To reproduce: use the following code snippet and refer to the attached gif file:

public Form1()
{
    InitializeComponent();
    for (int i = 0; i < 20; i++)
    {
        this.radGridView1.Columns.Add("Col" + i);
    }

    for (int i = 0; i < 10; i++)
    {
        GridViewDataRowInfo row = this.radGridView1.Rows.AddNew() as GridViewDataRowInfo;
        foreach (GridViewColumn col in this.radGridView1.Columns)
        {
            row.Cells[col.Name].Value = "Data" + row.Index + "." + col.Index;
        }
    }

    this.radGridView1.MultiSelect = true;
    this.radGridView1.SelectionMode = GridViewSelectionMode.CellSelect;
}


Workaround:
int startColumn = int.MaxValue;
int endColumn = 0;
int startRow = int.MaxValue;
int endRow = 0;

private void radGridView1_MouseDown(object sender, MouseEventArgs e)
{
    GridDataCellElement cellElement = this.radGridView1.ElementTree.GetElementAtPoint(e.Location) as GridDataCellElement;
    if (cellElement != null)
    {
        startColumn = cellElement.ColumnIndex;
        startRow = cellElement.RowIndex;
    }
}

private void radGridView1_MouseUp(object sender, MouseEventArgs e)
{
    GridDataCellElement cellElement = this.radGridView1.ElementTree.GetElementAtPoint(e.Location) as GridDataCellElement;
    if (cellElement != null)
    {
        endColumn = cellElement.ColumnIndex;
        endRow = cellElement.RowIndex;
    }

    if (endColumn < startColumn)
    {
        int swap = endColumn;
        endColumn = startColumn;
        startColumn = swap;
    }
    if (endRow < startRow)
    {
        int swap = endRow;
        endRow = startRow;
        startRow = swap;
    }

    this.radGridView1.ClearSelection();
    int scrollBarValue = this.radGridView1.TableElement.HScrollBar.Value;
    this.radGridView1.BeginUpdate();
    for (int i = startRow; i < endRow + 1; i++)
    {
        for (int j = startColumn; j < endColumn + 1; j++)
        {
            if (!this.radGridView1.Rows[i].Cells[j].IsSelected)
            {
                this.radGridView1.Rows[i].Cells[j].IsSelected = true;
            }
        }
    }
    this.radGridView1.EndUpdate();
    this.radGridView1.TableElement.HScrollBar.Value = scrollBarValue;
}

Hello,

I succeed to reproduce the GridViewComboboxColumn exception in this forum post:
http://www.telerik.com/forums/nullreferenceexception-4a6181b2453b#cwDrbIqzp0CPxcgh90b4rQ

I attach a sample project, the database (SQL Server 2012 Express) and a video from the exception.

To reproduce:
- Run the project,
- Sort the column "Állapot" descending.
- Click on column and drop down the list.
- Choose an another value, and click very fast twice. On a slow PC is much easier to reproduce the issue. The important thing, that you need select a value from the combobox and select another row very fast. (See the attached video)

I use the latest Trial version of Winforms.

If you have any question, please contact me.

Best Regards,
László

Workaround:

Private Sub gridMunkak_CreateCell(sender As Object, e As GridViewCreateCellEventArgs) Handles gridMunkak.CreateCell
    If e.CellType = GetType(GridComboBoxCellElement) Then
        e.CellElement = New MyGridComboBoxCellElement(e.Column, e.Row)
    End If
End Sub

Public Class MyGridComboBoxCellElement
    Inherits GridComboBoxCellElement
    Public Sub New(column As GridViewColumn, row As GridRowElement)
        MyBase.New(column, row)
    End Sub

    Public Overrides Sub SetContent()
        If Me.ColumnInfo IsNot Nothing Then
            MyBase.SetContent()
        End If
    End Sub
    Protected Overrides ReadOnly Property ThemeEffectiveType() As Type
        Get
            Return GetType(GridComboBoxCellElement)
        End Get
    End Property
End Class

How to Reproduce:
Source XML:
<?xml version="1.0" encoding="utf-8"?>
<grandparent Date="2014-12-17Z" Name="Grandparent" SchemaVersion="1.0" Time="04:27:07Z" xmlns="">
 <parent Name="parent1" City="Los Angeles">
   <child Name="Child1" Age="5"/>
   <child Name="Child2" Age="8"/>
 </parent>
 <parent Name="parent2" City="Chicago">
   <child Name="Child1" Age="11"/>
   <child Name="Child2" Age="15"/>
 </parent>
</grandparent>

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

            DataSet xmlDataSet = new DataSet();
            xmlDataSet.ReadXml(@"..\..\test.xml");
            GridViewTemplate parentTemplate = new GridViewTemplate();
            this.radGridView1.MasterTemplate.Templates.Add(parentTemplate);
            GridViewRelation relation = new GridViewRelation(this.radGridView1.MasterTemplate);
            relation.ChildTemplate = parentTemplate;
            relation.RelationName = "Grandparent_Parent";
            relation.ParentColumnNames.Add("grandparent_Id");
            relation.ChildColumnNames.Add("grandparent_Id");
            radGridView1.Relations.Add(relation);
            this.radGridView1.DataSource = xmlDataSet.Tables[0];
            parentTemplate.DataSource = xmlDataSet.Tables[1];
            parentTemplate.AllowAddNewRow = false;

            GridViewTemplate childTemplate = new GridViewTemplate();

            parentTemplate.Templates.Add(childTemplate);
            GridViewRelation childRelation = new GridViewRelation(parentTemplate);

            childRelation.ChildTemplate = childTemplate;
            childRelation.RelationName = "Parent_Child";
            childRelation.ParentColumnNames.Add("parent_Id");
            childRelation.ChildColumnNames.Add("parent_Id");
            radGridView1.Relations.Add(childRelation);

            childTemplate.DataSource = xmlDataSet.Tables[2];
        }
    }

Workaround - set the data sources of the templates last, or use auto generate hierarchy:
            this.radGridView1.AutoGenerateHierarchy = true;

            DataSet xmlDataSet = new DataSet();
            xmlDataSet.ReadXml(@"..\..\test.xml");
            this.radGridView1.DataSource = xmlDataSet;
            radGridView1.DataMember = "grandparent";

            this.radGridView1.AutoGenerateHierarchy = true;

To reproduce: use the following code snippet:
Sub New()
    InitializeComponent()

    Me.RadGridView1.EnableFiltering = True
    Me.RadGridView1.ShowHeaderCellButtons = True

    Dim dt As New DataTable
    dt.Columns.Add("Id", GetType(Integer))
    dt.Columns.Add("Name", GetType(String))
    dt.Columns.Add("Type", GetType(String))
    dt.Columns.Add("Active", GetType(Boolean))

    Dim typeList As New List(Of String)
    typeList.Add("REFERRAL")
    typeList.Add("EMPLOYEE")
    typeList.Add("Type3")
    typeList.Add("Type4")

    Dim rand As New Random
    For index = 1 To 10
        dt.Rows.Add(index, "Name" & index, typeList(rand.Next(0, typeList.Count)),If(index mod 2=0, True,false))
    Next

    Me.RadGridView1.AutoGenerateColumns = False
    Dim decimalColumn As New GridViewDecimalColumn("ID")
    decimalColumn.FieldName = "Id"
    RadGridView1.MasterTemplate.Columns.Add(decimalColumn)

    Dim textBoxColumn As New GridViewTextBoxColumn("Name")
    textBoxColumn.FieldName = "Name"
    RadGridView1.MasterTemplate.Columns.Add(textBoxColumn)

    Dim supplierColumn As GridViewComboBoxColumn = New GridViewComboBoxColumn("Type")
    supplierColumn.FieldName = "Type"
    supplierColumn.DataSource = typeList
    Me.RadGridView1.Columns.Add(supplierColumn)

    Dim checkBoxColumn As New GridViewCheckBoxColumn("Active")
    checkBoxColumn.FieldName = "Active"
    RadGridView1.MasterTemplate.Columns.Add(checkBoxColumn)

    Me.RadGridView1.DataSource = dt
    Me.RadGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill

End Sub

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

    Dim activeFilter As New FilterDescriptor()
    activeFilter.PropertyName = "Active"
    activeFilter.Operator = FilterOperator.IsEqualTo
    activeFilter.Value = True

    Dim typeFilter As New CompositeFilterDescriptor()
    typeFilter.FilterDescriptors.Add(New FilterDescriptor("Type", FilterOperator.IsEqualTo, "EMPLOYEE"))
    typeFilter.FilterDescriptors.Add(New FilterDescriptor("Type", FilterOperator.IsEqualTo, "REFERRAL"))
    typeFilter.LogicalOperator = FilterLogicalOperator.Or

    Dim overallFilterDescriptor As New CompositeFilterDescriptor()
    'overallFilterDescriptor.PropertyName = "Type"
    'overallFilterDescriptor.IsFilterEditor = True

    overallFilterDescriptor.FilterDescriptors.Add(typeFilter)
    overallFilterDescriptor.FilterDescriptors.Add(activeFilter)
    overallFilterDescriptor.LogicalOperator = FilterLogicalOperator.And

    Me.RadGridView1.FilterDescriptors.Add(overallFilterDescriptor)
End Sub


Run the project and click the button. You will see that the filter button is not orange indicating that there is applied filter. Additionally, the "Clear filter" option is disabled and the user is not allowed to see the entire data any more.

Workaround: set the overall CompositeFilterDescriptor.PropertyName to a specific column and the IsFilterEditor property to true. Thus, you will be allowed to clear the filter from this column.

To reproduce:
- Add some columns to a grid.
- Then add a column like this:
private void button2_Click(object sender, System.EventArgs e)
{
    radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
    Telerik.WinControls.UI.GridViewDataColumn gridViewColumn2 = new Telerik.WinControls.UI.GridViewCheckBoxColumn();
    gridViewColumn2.MinWidth = gridViewColumn2.MaxWidth = 22;
    gridViewColumn2.Width = 100;
   radGridView1.MasterTemplate.Columns.Add(gridViewColumn2);

    gridViewColumn2.MinWidth = 0;
    gridViewColumn2.MaxWidth = 0;

}

Please note that if you add two columns with the above code, you will be able to resize the first one, but  the cursor position is in wrong position.


Workaround:
- Set the MaxWidth before adding the column to the grid. 

To reproduce:
- Use RadDock with MDI mode.
- Add a form that contains a grid.
- Set the theme to Aqua.

Workaround:
 grid.GridViewElement.ForeColor = Color.Black; 

To reproduce:

public class ProgressBarCellElement : GridDataCellElement
{ 
          
    public ProgressBarCellElement(GridViewColumn column, GridRowElement row) : base(column, row)
    {
    }

    private RadProgressBarElement radProgressBarElement;

    protected override void CreateChildElements()
    {
        base.CreateChildElements();

        radProgressBarElement = new RadProgressBarElement();
        this.Children.Add(radProgressBarElement);
    }

    protected override void SetContentCore(object value)
    {
        if (this.Value != null && this.Value != DBNull.Value)
        {
            this.radProgressBarElement.Value1 = Convert.ToInt16(this.Value);
        }
    }

    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(GridDataCellElement);
        }
    }

    public override bool IsCompatible(GridViewColumn data, object context)
    {
        return data is ProgressBarColumn && context is GridDataRowElement;
    }
}

public class ProgressBarColumn : GridViewDataColumn
{
    public ProgressBarColumn() : base()
    {
    }

    public ProgressBarColumn(string fieldName) : base(fieldName)
    {
    }

    public override Type GetCellType(GridViewRowInfo row)
    {
        if (row is GridViewDataRowInfo)
        {
            return typeof(ProgressBarCellElement);
        }
        return base.GetCellType(row);
    }
}

It does not matter the type of the control that we want to move the focus on as well as if it was RadControl or not

To reproduce:
 private void radGridView1_CellBeginEdit(object sender, Telerik.WinControls.UI.GridViewCellCancelEventArgs e)
        {
            e.Cancel = true;
            // Some other control to move the focus on
            this.textBox1.Focus();
        }

Workaround:
Before cancelling the event set the value of the active editor to the current cell value

private void radGridView1_CellBeginEdit(object sender, Telerik.WinControls.UI.GridViewCellCancelEventArgs e)
{
    this.radGridView1.ActiveEditor.Value = e.Row.Cells[e.Column.Name].Value;
    e.Cancel = true;
    // Some other control to move the focus on
    this.textBox1.Focus();
}

To reproduce:
private void Form1_Load(object sender, EventArgs e)
{
    GridSearchRowElement searchRow = null;
    foreach (GridRowElement row in this.radGridView1.TableElement.VisualRows)
    {
        if (row is GridSearchRowElement)
        {
            searchRow = row as GridSearchRowElement;
            break;
        }
    }
    if (searchRow != null)
    {

        searchRow.SearchCellElement.SearchBoxWidth = 400;
    }
}

Workaround:
radGridView1.TableElement.InvalidateMeasure(true);           
radGridView1.TableElement.UpdateLayout();
 

To reproduce: create a form with a button on it where on its Click event you show another form with the following code snippet:

public class Dummy
    {
        public int ID { get; set; }
        public string Description { get; set; }
    }

public Form1()
{
    InitializeComponent();
    this.radGridView1.FilterChanged += radGridView1_FilterChanged;

    if (File.Exists(@"..\..\..\layout.xml"))
    {
        this.radGridView1.LoadLayout(@"..\..\..\layout.xml");
    }
    else
    {
        radGridView1.Columns.Add(new GridViewTextBoxColumn { HeaderText = "Id ", FieldName = "ID" });
        radGridView1.Columns.Add(new GridViewTextBoxColumn { HeaderText = "Description", FieldName = "DESCRIPTION" });
    }
    radGridView1.EnableFiltering = true;
    radGridView1.MasterTemplate.ShowHeaderCellButtons = true;
    radGridView1.MasterTemplate.ShowFilteringRow = true;

    var items = new List<Dummy>();
    
    for (int i = 0; i < 20; i++)
    {
        var dummy = new Dummy
        {
            ID = i,
            Description = string.Format("Description_{0}", i)
        };
        
        items.Add(dummy);
    }
    radGridView1.AutoGenerateColumns = false;
    radGridView1.DataSource = items;
}

private void radGridView1_FilterChanged(object sender, GridViewCollectionChangedEventArgs e)
{
    this.radGridView1.SaveLayout(@"..\..\..\layout.xml");
}

Please refer to the attached gif file illustrating the steps.

To reproduce:
1. Add a RadGridView and a RadButton.
2. Populate the grid with data and call the BestFitColumns( BestFitColumnMode.AllCells) method (or resize the columns).
3. Set its RightToLeft property to Windows.Forms.RightToLeft.Yes.
3. In the RadButton.Click event handler call the RadGridView.PrintPreview(). As a result the columns are shrunk. Please see the attached gif file.

Workaround:

Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
    Me.RadGridView1.BeginUpdate()
    Me.RadGridView1.PrintPreview()
    Me.RadGridView1.EndUpdate()
    Me.RadGridView1.BestFitColumns(BestFitColumnMode.AllCells)
End Sub

To reproduce:

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Me.CustomersTableAdapter.Fill(Me.NwindDataSet.Customers)

    Me.RadGridView1.BestFitColumns(Telerik.WinControls.UI.BestFitColumnMode.AllCells)
    Me.RadGridView1.Columns(2).IsPinned = True
    Me.RadGridView1.Columns(2).PinPosition = Telerik.WinControls.UI.PinnedColumnPosition.Left
    Me.RadGridView1.Columns(5).IsPinned = True
    Me.RadGridView1.Columns(5).PinPosition = Telerik.WinControls.UI.PinnedColumnPosition.Left
    Dim summaryItem As New GridViewSummaryItem()
    summaryItem.Name = "ContactTitle"
    summaryItem.Aggregate = GridAggregateFunction.Count

    Dim summaryRowItem As New GridViewSummaryRowItem()
    summaryRowItem.Add(summaryItem)
    Me.RadGridView1.SummaryRowsBottom.Add(summaryRowItem)

    Me.RadGridView1.MasterTemplate.ShowTotals = True
    Me.RadGridView1.EnableKineticScrolling = True
    Me.RadGridView1.MasterView.SummaryRows(0).PinPosition = PinnedRowPosition.Bottom
End Sub

Please refer to the attached gif file.