Hi,
as you can see from the attached images, when i rotate the screen (i am on a surface pro 4 with 200% zoom but it's happening also with 100%) the radwindow (as a mainwindow) does not handle the rotation correctly
please check also the project here https://onedrive.live.com/redir?resid=D2C17D45B1412CBA!114&authkey=!AAkiuRoVn6n7nVo&ithint=file%2czip
the scenario is different if you start the window in landscape or portait mode.
but in both scenario the window can't completely maximize