When I use the WindowsFormsHost in Radbusyindicator,
then I change the window size, and the UI shows very slowly and seems wrong.
The content of the WindowsFormsHost is just a Label.
I am not sure if there are some details in this case.
<telerik:RadBusyIndicator IsBusy="False">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<WindowsFormsHost>
<cc:UserControl1/>
</WindowsFormsHost>
</Grid>
</telerik:RadBusyIndicator>