In a RadLayoutControl I use LayoutControlTabGroup.
I can set the background of the Item's but not on the "empty" space, is there some way to do that.

  <telerik:RadLayoutControl >
      <telerik:LayoutControlTabGroup Background="White">
          <telerik:LayoutControlTabGroupItem Header="Tab 1" Background="Red">
              <Button Content="Item 1" />
          </telerik:LayoutControlTabGroupItem>
          <telerik:LayoutControlTabGroupItem Header="Tab 2"  Background="Blue">
              <Button Content="Item 2" />
          </telerik:LayoutControlTabGroupItem>
      </telerik:LayoutControlTabGroup>
  </telerik:RadLayoutControl>

<telerik:RadDocking HasDocumentHost="True">
    <telerik:RadDocking.DocumentHost>
        <telerik:RadSplitContainer>
            <telerik:RadPaneGroup>
                <telerik:RadDocumentPane Header="Document 1" Title="Document 1" />
            </telerik:RadPaneGroup>
        </telerik:RadSplitContainer>
    </telerik:RadDocking.DocumentHost>
</telerik:RadDocking>

Hi Team,

We are encountering an intermittent IndexOutOfRangeException when calling XamlFormatProvider.Export() on a RadDocument.

Exception stack:

System.IndexOutOfRangeException
 at System.Collections.Generic.Dictionary`2.Insert
 at Telerik.Windows.Documents.FormatProviders.Xaml.XamlWriter.TryGetTypeConverter
 at Telerik.Windows.Documents.FormatProviders.Xaml.XamlFormatProvider.Export(RadDocument)

Code:

private string ReadDocumentText(RadDocument document)
{
    if (document == null) return string.Empty;
    return new XamlFormatProvider().Export(document);
}

Notes:

• document is not null

• Each document is different

• Same code works for most documents

• The exception occurs inside Telerik export logic

• Documents are exported concurrently (parallel processing)

• No custom type converters or custom styles added explicitly

Questions:

• Is XamlFormatProvider.Export() thread-safe when used concurrently?

• Can concurrent exports cause internal state corruption (e.g. type converter dictionary)?

• Is there a recommended approach for exporting RadDocument in parallel (e.g. synchronization or per-thread isolation)?

Any guidance would be appreciated.

Thanks.
Zafeer

Hi ,

We have integrated RadRichTextBox into our WPF (C#) application and are trying to add RadCallout as a custom context menu. since the control is being created entirely in code-behind without XAML ,we are encountering implementation challenges.

Could you please guide us on how to achieve this?

Hello,

I have attempted to implement the solutions listed here.

We are using various ColorVariations along with our themes, however. For example:

StyleManager.ApplicationTheme = new Windows11Theme(Windows11Palette.ColorVariation.Dark);

The solutions listed in the link above throw the following exception:

System.InvalidOperationException: The calling thread cannot access this object because a different thread owns it.

Is there a way to use theme ColorVariations along with RadSplashScreen?

Thank you

We have an app that has RadComboBox controls arranged above some RadNumericUpDown controls. For the RadNumericUpDown controls we have it set up to open a numeric pad on PreviewMouseUp to support both mouse and touch. The issue we have is that when a combobox item is selected that lies over a numericupdown using touch, the numericupdown control receives the focus and activates the numeric pad. This does not occur when using a mouse.

Attached is an example derived from our app that reproduces this behavior. Selecting Pounds or Newtons from the Force combobox using touch will cause a message box to appear.

Is there any way to work around this behavior? It is annoying but not a show-stopper.

Thanks,
Jim

Hi,

When using RadGridView ExportAndShow method (GridViewExportFormat = Csv or Txt), the first data row is inserted next to column headers, it's missing a carriage return.

ResultGrid.ExportAndShow(GridViewExportFormat.Csv, "fileName.txt", true);

I'm using Telerik.UI.for.Wpf.80.Xaml 2025.4.1321