Prevent Dragging Off the Screen
With its default settings, the RadWindow can be dragged off the screen by the user. To prevent the user from dragging the RadWindow off the screen you have to set the IsRestricted property of the RadWindow to True.
RadWindow radWindow = new RadWindow();
radWindow.IsRestricted = true;
Dim radWindow As New RadWindow()
radWindow.IsRestricted = True