You can allow the RadWindow control to take the entire screen. This behavior is not default for it, so if you want to enable it, use the
IsFullScreen property and set it to True.
When enabled the FullScreen mode will take precedence over the other properties regarding the window's
placement. To learn more about them read the Placement and the Size Modes topics.
Here is an example.
<telerikPrimitives:RadWindow x:Name="radWindow" IsFullScreen="True" />