The current workaround we can offer is to define the following style for the RadioButton element: <Style TargetType="RadioButton" BasedOn="{StaticResource RadioButtonStyle}"> <Style.Triggers> <Trigger Property="IsChecked" Value="True"> <Setter Property="BorderBrush" Value="{telerik1:FluentResource ResourceKey=AccentBrush}" /> </Trigger> </Style.Triggers> </Style> Where xmlns:telerik1="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
Hi, The fix will be available in our next official version – R2 2018, scheduled for the middle of May. Best regards, Ralitsa Kumanova