Please refer to the attached sample project and gif file illustrating the behavior.
ColumnGroupsViewDefinition view = this.radGridView1.ViewDefinition as ColumnGroupsViewDefinition;

            foreach (GridViewColumnGroup group in view.ColumnGroups)
            {
                group.ShowHeader = false;
            }

Workaround: use the ViewCellFormatting and enable the back color for the header cells that are over the hidden group headers

public RadForm1()
{
    InitializeComponent();

    ColumnGroupsViewDefinition view = this.radGridView1.ViewDefinition as ColumnGroupsViewDefinition ;
    foreach (GridViewColumnGroup group in view.ColumnGroups)
    {
        group.ShowHeader = false;
    }
}

private void radGridView1_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.Row is GridViewTableHeaderRowInfo && !(e.CellElement is GridColumnGroupCellElement))
    {
        e.CellElement.DrawFill = true;
        e.CellElement.BackColor = Color.FromArgb(234, 242, 252);
        e.CellElement.GradientStyle = GradientStyles.Solid;
    }
    else
    { 
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.GradientStyleProperty, ValueResetFlags.Local);
    }
}

How to reproduce:
public partial class Form1 : Form
{
    public class Data
    {
        public bool Checked { get; set; }
        public string Text { get; set; }
    }

    private readonly RadGridView _grid;

    private readonly List<Data> _dataList = new List<Data>
    {
        new Data {Text = "abc"},
        new Data {Text = "def"},
        new Data {Text = "ghi"},
        new Data {Text = "jkl"},
        new Data {Text = "mno"},
        new Data {Text = "pqr"},
        new Data {Text = "stu"},
        new Data {Text = "vwx"},
        new Data {Text = "yz0"}
    };

    public Form1()
    {
        InitializeComponent();

        _grid = new RadGridView
        {
            Dock = DockStyle.Fill,
            AllowSearchRow = true
        };

        Controls.Add(_grid);

        _grid.DataSource = _dataList;
    }

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);

        _grid.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
        ((GridViewCheckBoxColumn)_grid.Columns["Checked"]).EnableHeaderCheckBox = true;
        
        _grid.Columns["Checked"].SortOrder = RadSortOrder.Ascending;
        ((GridViewCheckBoxColumn)_grid.Columns["Checked"]).Checked = ToggleState.On;
        _grid.MasterView.TableSearchRow.Search("abc");
    }
}

Workaround: clear the search text
protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);

    _grid.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
    ((GridViewCheckBoxColumn)_grid.Columns["Checked"]).EnableHeaderCheckBox = true;
    
    _grid.Columns["Checked"].SortOrder = RadSortOrder.Ascending;
    ((GridViewCheckBoxColumn)_grid.Columns["Checked"]).Checked = ToggleState.On;
    _grid.MasterView.TableSearchRow.Search("abc");

    this._grid.MouseDown += _grid_MouseDown;
}

private void _grid_MouseDown(object sender, MouseEventArgs e)
{
    RadGridView grid = (RadGridView)sender;
    RadCheckBoxElement cell = grid.ElementTree.GetElementAtPoint(e.Location) as RadCheckBoxElement;
    if (cell != null && cell.Parent is GridCheckBoxHeaderCellElement && grid.SortDescriptors.Count > 0))
    {
        grid.MasterView.TableSearchRow.Search("");
    }
}

To reproduce: please refer to the attached gif file and sample project.

Workaround: when you set the DrawFill property to true, specify the BackColor to the desired one and reset for the rest of the cells.

private void radGridView1_CellFormatting(object sender, Telerik.WinControls.UI.CellFormattingEventArgs e)
{
    if (e.Column.Name == "ProductName" && e.Row is GridViewDataRowInfo)
    {
        if (e.CellElement.Value.ToString().Contains("C"))
        {
            e.CellElement.DrawFill = true;
            e.CellElement.BackColor = Color.Yellow;
            e.CellElement.GradientStyle = GradientStyles.Solid;
            e.CellElement.ForeColor = Color.OliveDrab;
        }
        else
        { 
            e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
            e.CellElement.ResetValue(LightVisualElement.GradientStyleProperty, ValueResetFlags.Local);
            e.CellElement.ResetValue(LightVisualElement.ForeColorProperty, ValueResetFlags.Local);  
            e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);  
        }
    }
    else
    { 
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.GradientStyleProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.ForeColorProperty, ValueResetFlags.Local);    
        e.CellElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);  
    }
}

To reproduce:
protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    DataTable dt = NewDt();
    this.radGridView1.DataSource = dt;      
    var c = this.radGridView1.Columns["Calculted"] as GridViewDecimalColumn;
    c.EnableExpressionEditor = true;
    c.Expression = "Column2 / SUM(Column2) * 10";
    c.DecimalPlaces = 2;
    c.FormatString = "{0:N2}";

    this.radGridView1.GroupDescriptors.Add("GroupByColumn", ListSortDirection.Ascending);
}

private DataTable NewDt()
{
    var dt = new DataTable();
    dt.Columns.Add("ItemColumn");
    dt.Columns.Add("GroupByColumn");
    dt.Columns.Add("Column2", typeof(decimal));
    dt.Columns.Add("Calculted", typeof(decimal));

    for (int i = 1; i <= 20; i++)
    {
        string gr = string.Empty;
        if (i % 3 == 0)
            gr = "gr3";
        else if (i % 2 == 0)
            gr = "gr2";
        else if (i % 5 == 0)
            gr = "gr5";
        else
            gr = "item" + i.ToString();

        dt.Rows.Add("id #" + i.ToString(), gr, i, 0);
    }
    return dt;
}

Workaround:
public class CustomExpressionContext : Telerik.Data.Expressions.ExpressionContext
{

    RadGridView radGridView;
    public CustomExpressionContext(RadGridView grid)
    {
        this.radGridView = grid;
    }

    public decimal MySum(string columnName)
    {
        decimal sum = 0;
        
        foreach (var item in radGridView.Rows)
        {
            sum += (decimal)item.Cells[columnName].Value;
        }
        return sum;
    }
}

 Telerik.Data.Expressions.ExpressionContext.Context = new CustomExpressionContext(this.radGridView1);

To reproduce: please refer to the attached sample project and gif file illustrating the behavior. Add cell value in the new row and press teh down arrow.

Workaround: this.radGridView1.MasterTemplate.SelectLastAddedRow = false;

This problem is applicable for OpenEdge as well: http://knowledgebase.progress.com/articles/Article/Telerik-RadGridView-highlights-unnecessary-columns-and-rows-in-batch-mode

To reproduce: please refer to the attached sample project and gif file illustrating the behavior.

Workaround: in order to cancel adding of the new row, you can call the MasterView.TableAddNewRow.CancelAddNewRow method:

private void radGridView1_UserAddingRow(object sender, Telerik.WinControls.UI.GridViewRowCancelEventArgs e)
{
    e.Cancel = true;
    this.radGridView1.MasterView.TableAddNewRow.CancelAddNewRow(); 
    int index = this.radGridView1.Rows.Count;
    this.radGridView1.Rows.Add(index, "Row" + index);
}

To reproduce:
private void MasterTemplate_ViewChanged(object sender, DataViewChangedEventArgs args)
{
    if (args.Action == ViewChangedAction.ExpandedChanged)
    {

    }
}
Workaround:
- Use the GroupExpanded event.

To reproduce:
- Add default values for all cells in the grid.
- Try to add the new row without changing any value.

Workaround:
private void RadGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
    var editor = radGridView1.ActiveEditor as BaseInputEditor;
    var field = editor.GetType().GetField("originalValue", BindingFlags.NonPublic | BindingFlags.Instance);
    field.SetValue(editor, "asd");
}

To reproduce:
- Add DateTime columns to the grid and set the MaskType of the editor to FreeFormDateTime.
- Go to the new row enter a valid date and press Tab.

Workaround:
class Myditor : RadDateTimeEditor
{
    public override bool IsModified
    {
        get
        {
            return true;

        }
    }
}

Please refer to the attached sample project and gif file illustrating the problem.

Workaround:
Sub New() 
    InitializeComponent()
    AddHandler Me.RadGridView1.CreateCell, AddressOf RadGridView_CreateCell
End Sub

Public Class CustomGridFilterCellElement
Inherits GridFilterCellElement
    
    Protected Overrides ReadOnly Property ThemeEffectiveType() As Type
        Get
            Return GetType(GridFilterCellElement)
        End Get
    End Property
    Public Sub New(column As GridViewDataColumn, row As GridRowElement)
        MyBase.New(column, row)
    End Sub

    Protected Overrides Function ApplyFormatString(value As Object) As String
        Return CDate(value).ToString("dd.MM.yyyy")
    End Function
End Class

To reproduce:

this.Controls.Add(this.radGridView1);
this.radScheduler1.Dock = DockStyle.Fill;

List<GridRec> records = new List<GridRec>();
GridRec rec = new GridRec();
rec.Column1 = "1";
rec.Column2 = "2";
rec.Column3 = "3";
rec.Column4 = "4";
rec.Column5 = "5";
rec.Column6 = "6";
rec.Column7 = "7";
rec.Column8 = "8";
rec.Column9 = "9";

for (int i = 0; i < 20; ++i)
{
    records.Add(rec.Clone());
}

radGridView1.DataSource = records;
this.radGridView1.MultiSelect = true;
this.radGridView1.SelectionMode = GridViewSelectionMode.CellSelect;
this.radGridView1.Dock = DockStyle.Fill;

public class GridRec
{
    public GridRec Clone()
    {
        return this.MemberwiseClone() as GridRec;
    }

    public string Column1 { get; set; }

    public string Column2 { get; set; }

    public string Column3 { get; set; }
    
    public string Column4 { get; set; }

    public string Column5 { get; set; }

    public string Column6 { get; set; }

    public string Column7 { get; set; }

    public string Column8 { get; set; }

    public string Column9 { get; set; }
}

If you run the application, it starts with the upper-left most cell selected.  Now, while holding down the Shift key, left-click on the cell in the 5th column of the 5th row (cell 5:5).  Note all 25 cells are selected as expected.  Now, while still holding Shift, left-click again on cell 5:5 and note the selection is cleared.
Now, while still holding Shift, click on cell 4:4 (4th column, 4th row).  Note how the selected range is now cells 1:1 through 4:4.  And while still holding Shift, if you click on 4:4 yet again, the selection is cleared.

Workaround: 

private void radGridView1_SelectionChanging(object sender, Telerik.WinControls.UI.GridViewSelectionCancelEventArgs e)
{
    if (e.ColumnStartIndex == e.ColumnEndIndex && Control.ModifierKeys == Keys.Shift)
    {
        e.Cancel = true;
    }
}

Use the attached project to reproduce.

Workaround:
Set the MaxWidth/MinWidth of the column manually.

Steps to reproduce:

1. Add a CompositeFilterDescriptor programmatically as it is demonstrated in the following help article: http://docs.telerik.com/devtools/winforms/gridview/filtering/setting-filters-programmatically-(composite-descriptors)
2. Save the layout.
3. Load the layout.

Use attached project to reproduce.

Workaround:
Seth te PropertyName to a valid column name.

To reproduce use the attached project. 

Workaround:
Private Sub gvData_UserAddedRow(sender As Object, e As Telerik.WinControls.UI.GridViewRowEventArgs) Handles gvData.UserAddedRow
    Dim pi = GetType(GridViewNewRowInfo).GetProperty("MoveToLastRow", Reflection.BindingFlags.Instance Or Reflection.BindingFlags.NonPublic)
    pi.SetValue(Me.gvData.MasterView.TableAddNewRow, True, Nothing)
End Sub

Hello,

we have a RadGridview with a number column and a activated filter for this Grid. 
If we want to filter data by the value "123" the input in the filter textBox is shown as "321.00" (right-to-left).

This is no problem by columns with text values. And at the line for a new data row the input is correct, too.

To reproduce:

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

dt.Rows.Add(1, "Parent1", false);
dt.Rows.Add(2, "Parent2", false);

this.radGridView1.DataSource = dt;
((GridViewCheckBoxColumn)this.radGridView1.MasterTemplate.Columns["IsActive"]).EnableHeaderCheckBox = true;
this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;

DataTable childDataTable = new DataTable();
childDataTable.Columns.Add("Id", typeof(int));
childDataTable.Columns.Add("Title", typeof(string));
childDataTable.Columns.Add("ParentId", typeof(int));            
childDataTable.Columns.Add("IsValid", typeof(bool));
childDataTable.Rows.Add(1, "Child 1", 1, false);
childDataTable.Rows.Add(2, "Child 1", 1, false);
childDataTable.Rows.Add(3, "Child 2", 2, false);
childDataTable.Rows.Add(4, "Child 2", 2, false);

GridViewTemplate template = new GridViewTemplate();
template.DataSource = childDataTable;            
((GridViewCheckBoxColumn)template.Columns["IsValid"]).EnableHeaderCheckBox = true;
radGridView1.MasterTemplate.Templates.Add(template);
template.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

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

To reproduce, add menu item in the filtering context menu and upon click, set it as checked. Note that the filtering cell text should also take the custom menu item text or there should be an approach to set it.
Workaround: uncomment the commented code below.

protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            AddGrid();

            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);
            }
            dt.Rows.Add(5, null);
            dt.Rows.Add(6, "");

            radGridView1.ShowHeaderCellButtons = true;
            this.radGridView1.DataSource = dt;
            this.radGridView1.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill;
            this.radGridView1.EnableFiltering = true;
            this.radGridView1.EnableCustomFiltering = true;
            //radGridView1.ContextMenuOpening += radGridView1_ContextMenuOpening;
        }

        private void radGridView1_ContextMenuOpening(object sender, Telerik.WinControls.UI.ContextMenuOpeningEventArgs e)
        {
            GridFilterCellElement filterCell = e.ContextMenuProvider as GridFilterCellElement;
            GridViewDataColumn dataCol = (GridViewDataColumn)filterCell.ColumnInfo;
            if (filterCell != null)
            {
                if (filterCell.ColumnInfo.Name == "Name")
                {
                    RadMenuItem isNullMenuItem = new RadMenuItem();
                    isNullMenuItem.Click += customMenuItem_Click;
                    isNullMenuItem.Text = "My IsNull";
                    isNullMenuItem.Tag = filterCell.ColumnInfo.Name;
                    e.ContextMenu.Items.Add(isNullMenuItem);

                    RadMenuItem isNotNullMenuItem = new RadMenuItem();
                    isNotNullMenuItem.Click += customMenuItem_Click;
                    isNotNullMenuItem.Text = "My IsNotNull";
                    isNotNullMenuItem.Tag = filterCell.ColumnInfo.Name;
                    e.ContextMenu.Items.Add(isNotNullMenuItem);

                    bool isCustomFilter = (dataCol.FilterDescriptor != null &&
                        dataCol.FilterDescriptor is CompositeFilterDescriptor &&
                        dataCol.FilterDescriptor.Expression.Contains("NULL"));

                    foreach (RadMenuItem item in e.ContextMenu.Items)
                    {
                        if (item.Text == "Is null" || item.Text == "Is not null")
                        {
                            item.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
                        }
                        //if (isCustomFilter)
                        //{
                        //    item.IsChecked = false;
                        //}
                    }
                    //if (isCustomFilter)
                    //{
                    //    if (((CompositeFilterDescriptor)dataCol.FilterDescriptor).LogicalOperator == FilterLogicalOperator.And)
                    //    {
                    //        isNotNullMenuItem.IsChecked = true;
                    //    }
                    //    else
                    //    {
                    //        isNullMenuItem.IsChecked = true;
                    //    }
                    //}
                }
            }
        }

        private void customMenuItem_Click(object sender, EventArgs e)
        {
            RadMenuItem clickedItem = (RadMenuItem)sender;
            string columnName = clickedItem.Tag.ToString();
            radGridView1.Columns[columnName].FilterDescriptor = null;

            FilterOperator filterOperator = clickedItem.Text.Contains("Not") ? FilterOperator.IsNotEqualTo : FilterOperator.IsEqualTo;
            FilterLogicalOperator logicalOperator = clickedItem.Text.Contains("Not") ? FilterLogicalOperator.And : FilterLogicalOperator.Or;

            CompositeFilterDescriptor compositeFilter = new CompositeFilterDescriptor();
            compositeFilter.FilterDescriptors.Add(new FilterDescriptor(columnName, filterOperator, ""));
            compositeFilter.FilterDescriptors.Add(new FilterDescriptor(columnName, filterOperator, null));
            compositeFilter.LogicalOperator = logicalOperator;
            compositeFilter.IsFilterEditor = true;
            this.radGridView1.FilterDescriptors.Add(compositeFilter);

            clickedItem.IsChecked = true;
        }

To reproduce: run the attached sample project. You will notice the result illustrated in the provided screenshot. Although the grid is RTL, the print preview dialog show it in LTR.

Workaround:

public class CustomGridPrintStyle : GridPrintStyle
{
    protected override BaseGridPrintRenderer InitializePrintRenderer(RadGridView grid)
    {
        if (this.PrintRenderer != null)
        {
            this.PrintRenderer.PrintCellPaint -= renderer_PrintCellPaint;
            this.PrintRenderer.PrintCellFormatting -= renderer_PrintCellFormatting;
            this.PrintRenderer.ChildViewPrinting -= renderer_ChildViewPrinting;
        }

        BaseGridPrintRenderer renderer = null;

        if (grid.ViewDefinition.GetType() == typeof(ColumnGroupsViewDefinition))
        {
            if (!(renderer is ColumnGroupsViewDefinitionPrintRenderer))
            {
                renderer = new CustomColumnGroupsViewDefinitionPrintRenderer(grid);
            }
        }
        else if (grid.ViewDefinition.GetType() == typeof(HtmlViewDefinition))
        {
            if (!(renderer is HtmlViewDefinitionPrintRenderer))
            {
                renderer = new HtmlViewDefinitionPrintRenderer(grid);
            }
        }
        else
        {
            if (!(renderer is TableViewDefinitionPrintRenderer))
            {
                renderer = new TableViewDefinitionPrintRenderer(grid);
            }
        }

        renderer.ChildViewPrinting += renderer_ChildViewPrinting;
        renderer.PrintCellFormatting += renderer_PrintCellFormatting;
        renderer.PrintCellPaint += renderer_PrintCellPaint;

        return renderer; 
    }

    private void renderer_PrintCellPaint(object sender, PrintCellPaintEventArgs e)
    {
        this.OnPrintCellPaint(sender, e);
    }

    private void renderer_PrintCellFormatting(object sender, PrintCellFormattingEventArgs e)
    {
        this.OnPrintCellFormatting(sender, e);
    }

    private void renderer_ChildViewPrinting(object sender, ChildViewPrintingEventArgs e)
    {
        this.OnChildViewPrinting(sender, e);
    }
}

public class CustomColumnGroupsViewDefinitionPrintRenderer : ColumnGroupsViewDefinitionPrintRenderer
{
    public CustomColumnGroupsViewDefinitionPrintRenderer(RadGridView grid) : base(grid)
    {
    }

    protected override void PrintRow(GridViewRowInfo row, ColumnGroupRowLayout rowLayout, GridPrintSettings settings, int currentX, int currentY, Graphics graphics)
    { 
        float scrollableColumnsOffset = 0f;
        float rightPinnedColumnsOffset = 0f;

        foreach (GridViewColumn col in rowLayout.RenderColumns)
        {
            if (col is GridViewRowHeaderColumn || col is GridViewIndentColumn)
            {
                continue;
            }

            float height = rowLayout.GetRowHeight(row);
            RectangleF cellBounds = rowLayout.GetCorrectedColumnBounds(row, col, this.GridView.RightToLeft == RightToLeft.Yes,
                new RectangleF(0f, 0f, rowLayout.DesiredSize.Width, height));

            if (cellBounds == RectangleF.Empty)
            {
                continue;
            }

            if (col.PinPosition == PinnedColumnPosition.Left)
            {
                if (scrollableColumnsOffset < cellBounds.Right + rowLayout.Owner.CellSpacing)
                {
                    scrollableColumnsOffset = cellBounds.Right + rowLayout.Owner.CellSpacing;
                    rightPinnedColumnsOffset = scrollableColumnsOffset;
                }
            }
            else if (col.PinPosition == PinnedColumnPosition.None)
            {
                if (rightPinnedColumnsOffset < scrollableColumnsOffset + cellBounds.Right + rowLayout.Owner.CellSpacing)
                {
                    rightPinnedColumnsOffset = scrollableColumnsOffset + cellBounds.Right + rowLayout.Owner.CellSpacing;
                }

                cellBounds.X += scrollableColumnsOffset;
            }
            else
            {
                cellBounds.X += rightPinnedColumnsOffset;
            }

            cellBounds.Offset(currentX, currentY);

            GridViewCellInfo cell;
            CellPrintElement printCell;

            if (row is GridViewTableHeaderRowInfo)
            {
                cell = this.GridView.MasterView.TableHeaderRow.Cells[col.Name];

                printCell = this.CreateHeaderCellPrintElement(col);
                if (printCell.Font != settings.HeaderCellFont)
                {
                    if (settings.HeaderCellFont != null)
                    {
                        printCell.Font = settings.HeaderCellFont;
                    }
                    else
                    {
                        settings.HeaderCellFont = printCell.Font;
                    }
                }
            }
            else if (row is GridViewSummaryRowInfo)
            {
                GridViewSummaryRowInfo rowInfo = row as GridViewSummaryRowInfo;
                cell = rowInfo.Cells[col.Name];

                if (cell == null)
                {
                    continue;
                }

                printCell = this.CreateSummaryCellPrintElement(cell);
                if (printCell.Font != settings.SummaryCellFont)
                {
                    if (settings.SummaryCellFont != null)
                    {
                        printCell.Font = settings.SummaryCellFont;
                    }
                    else
                    {
                        settings.SummaryCellFont = printCell.Font;
                    }
                }
            }
            else
            {
                cell = row.Cells[col.Name];

                if (cell == null)
                {
                    continue;
                }

                if (col is GridViewImageColumn)
                {
                    printCell = this.CreateImageCellPrintElement(cell);
                }
                else
                {
                    printCell = this.CreateDataCellPrintElement(cell);
                    if (printCell.Font != settings.CellFont)
                    {
                        if (settings.CellFont != null)
                        {
                            printCell.Font = settings.CellFont;
                        }
                        else
                        {
                            settings.CellFont = printCell.Font;
                        }
                    }
                }
            }

            printCell.TextPadding = this.GridView.PrintStyle.CellPadding;
            printCell.RightToLeft = this.GridView.RightToLeft == RightToLeft.Yes;

            Rectangle rect = new Rectangle((int)cellBounds.X, (int)cellBounds.Y, (int)cellBounds.Width, (int)cellBounds.Height);

            PrintCellFormattingEventArgs formattEventArgs = new PrintCellFormattingEventArgs(row, col, printCell);
            this.OnPrintCellFormatting(formattEventArgs);

            formattEventArgs.PrintCell.Paint(graphics, rect);
           
            PrintCellPaintEventArgs paintEventArgs = new PrintCellPaintEventArgs(graphics, row, col, rect);
            this.OnPrintCellPaint(paintEventArgs);               
        }
    }
}

private void radButton1_Click(object sender, EventArgs e)
{ 
    CustomGridPrintStyle style = new CustomGridPrintStyle();
    
    this.radGridView1.PrintStyle = style;
    RadPrintDocument printDoc = new RadPrintDocument();
    printDoc.Landscape = true;
    printDoc.RightHeader = "Right Header";
    printDoc.HeaderHeight = 100;
    printDoc.AssociatedObject = this.radGridView1;
    
    RadPrintPreviewDialog dialog = new RadPrintPreviewDialog(printDoc);
    
    dialog.Size = new System.Drawing.Size(Screen.PrimaryScreen.Bounds.Width - 200, Screen.PrimaryScreen.Bounds.Height - 200);
    dialog.SetZoom(0.80);
    dialog.ShowDialog();
}

There should be a way for users to determine if a row passes a certain filter criteria without that affecting any data operations.

The GridViewCheckBoxColumn.EditMode property controls when the value of the editor will be submitted to the cell. By default, the value is OnValidate and the value will be submitted only when the current cell changes, the grid looses focus or the active editor is closed by pressing Enter. If you set the EditMode property to OnValueChange it will submit the value immediately after the editor value changes. Please refer to the attached gif files illustrating the difference between the two modes.

To reproduce: if you set the GridViewCheckBoxColumn.EnableHeaderCheckBox property to true, the cell value is always submitted immediately after toggle/untoggle the checkbox without considering that EditMode.OnValidate is used.