The same property is available for MS TooltipService in WPF. 

The character is rendered with different glyph geometry and wrong glyph width which results in overlapping text.

If you place a TextBlock in the QuickAccessToolbar and the Ofice_Black theme is applied you get black foreground on black background which makes the text unreadable. The content of the QAT must respect the theme applied to the RadRibbonView control.

Implement a mechanism that allows embedding font data when exporting documents.

ApplicationMenu do not have keyboard navigation - pressing arrows do not navigate thru the application menu items.
Declined as a duplicate of: https://feedback.telerik.com/wpf/1352753-ribbonview-applicationmenu-do-not-have-keyboard-navigation.

Add support for axis with multi-level categories
Declined as a duplicate of: https://feedback.telerik.com/wpf/1351027-chartview-add-support-for-axis-with-multi-level-categories

When you hit the Enter key and a number simultaneously the number is removed from the Value of the RadMaskedNumericInput

Workaround:
Handle the KeyDown event of the RadMaskedNumericInput control, when the Enter key is pressed.

private void INPUT_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        if (INPUT.Value.ToString().Length > 0)
        {
            RadWindow.Alert(INPUT.Value.ToString());
        }
        e.Handled = true;
    }
}

When exporting a document in a Silverlight project using the XamlFormatProvider an exception is thrown.

The Gridview Distinct Filters can't be reuse if the filtering panel is close.

When the filter panel is reopen selecting or deselecting distinct filter have no effect.

This is reproductible in telerik demo in any gridview with distinct filter.

the bug is present in browser and oob applications.

RadMaps Silverlight BingMap provider stopped displaying tiles in 2022 due to change in Bing Maps service.

Check notes here:

https://docs.microsoft.com/en-us/answers/questions/799630/arcgis-map-services-stopped-loading.html

Either workaround or statement regarding the future of this feature is needed.

Missing StaticResource error (ScrollBarStyle) is thrown when using implicit styles and merging the Telerik.Windows.Controls.RichTextBoxUI.xaml file.

The tool does not found issues in a Silverlight project

RTF documents that do not define the appropriate style types in the style definitions are not processable in RTB. While this is a deviation from the standard, MS Word manages to fix them and then open them.

You could repair the invalid file using the project from the attachment.

When the MinTimeRulerExtent of a view definition is lowered (to the point that the view does not have a scrollbar) and the EnableSmallAppointmentRendering is true, the content of the group headers is not displayed.