public class FixedDataCellsPresenterAutomationPeer : FrameworkElementAutomationPeer
{
    public FixedDataCellsPresenterAutomationPeer(FixedDataCellsPresenter owner)
        : base(owner)
    {
    }

    protected override List<AutomationPeer> GetChildrenCore()
    {
        var children = new List<AutomationPeer>();
        CollectHeaderCellPeers(this.Owner, children);
        return children;
    }

    protected override AutomationControlType GetAutomationControlTypeCore()
    {
        return AutomationControlType.Header;
    }

    private static void CollectHeaderCellPeers(DependencyObject parent, List<AutomationPeer> result)
    {
        int count = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < count; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            if (child is GridViewHeaderCell headerCell)
            {
                var peer = UIElementAutomationPeer.CreatePeerForElement(headerCell);
                if (peer != null)
                {
                    result.Add(peer);
                }
            }
            else
            {
                CollectHeaderCellPeers(child, result);
            }
        }
    }
}

  public class FixedDataCellsPresenter : DataCellsPresenter
  {
      protected override AutomationPeer OnCreateAutomationPeer()
      {
          return new FixedDataCellsPresenterAutomationPeer(this);
      }
}

<Window.Resources>
    <ControlTemplate x:Key="FixedGridViewHeaderRowTemplate" TargetType="grid:GridViewHeaderRow">
          <!-- other elements -->
            <local:FixedDataCellsPresenter x:Name="PART_DataCellsPresenter"
                                           AutomationProperties.Name="Header Cells Presenter"
                                           Grid.Row="1"
                                           Grid.Column="3" />
           <!-- other elements -->
    </ControlTemplate>
    <Style TargetType="grid:GridViewHeaderRow">
        <Setter Property="Template" Value="{StaticResource FixedGridViewHeaderRowTemplate}" />
    </Style>
</Window.Resources>

<img align="top"
     width="170" height="61" />

 private void RadGridView_Pasted(object sender, RadRoutedEventArgs e)
 {
     var editableView = (IEditableCollectionView)this.gridView.Items;
     var affectedItems = this.gridView.SelectedCells.Select(c => c.Item).Distinct().ToList();

     foreach (var item in affectedItems)
     {
         editableView.EditItem(item);
         editableView.CommitEdit();
     }
 }

Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.EnsureSourceProperty(Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition propertyDefinition) Line 3279 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.RetrieveCurrentContextPropertyValue(Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition propertyDefinition) Line 3207 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridField.CurrentContextPropertyValue.get() Line 70 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridField.SetDataContextWhenEditorAttributeIsSet(System.Windows.FrameworkElement content, Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition contextPropertyDefinition) Line 394 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridFieldContentPresenter.PrepareEditor() Line 184 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridFieldContentPresenter.BeginEdit() Line 93 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.BeginEditSafe(Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridField field) Line 1243 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.EnsureFieldForEditOperation(Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition propertyDefinition, System.Action<Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridField> finishedCallback, System.Action<Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition> failedCallback) Line 1194 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.BeginEdit(Telerik.Windows.Controls.Data.PropertyGrid.PropertyDefinition propertyDefinition) Line 1224 C#
  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.RadPropertyGrid.BeginEdit() Line 1204 C#  Telerik.Windows.Controls.Data.dll!Telerik.Windows.Controls.Data.PropertyGrid.PropertyGridFieldContentPresenter.OnMouseLeftButtonUp(System.Windows.Input.MouseButtonEventArgs e) Line 57 C#

<telerik:RadPropertyGrid EditMode="Single" RenderMode="Flat" EnableEditorCaching="False" />

private void RadRibbonView_PreviewKeyDown(object sender, KeyEventArgs e)
{
    var ribbon = (RadRibbonView)sender;
    if (ribbon.IsMinimized && (e.Key == Key.Left || e.Key == Key.Right))
    {
        var focusedHeader = Keyboard.FocusedElement as RadRibbonTab;
        if (focusedHeader != null && ribbon.SelectedItem != focusedHeader)
        {
            ribbon.SelectedItem = focusedHeader;
            e.Handled = false;
        }
    }
}

private void onPreviewGotKeyboardFocus(object s, KeyboardFocusChangedEventArgs e)
{
    if (!this.SuppressAutoFocus || _wasFocusSuppressed)
    {
        return;
    }

    _wasFocusSuppressed = true;
    e.Handled = true;
}

if (flag)
{
    base.Dispatcher.BeginInvoke((Action)delegate
    {
        Focus();
    });
}