Thank you for your quick answer!
FOUC - great name! Now I know how to google for this behavior...
unfortunately the problem is still there - A "MainElement".show() right after the Application.init is still to early... only a ugly
works... this is ok for the first step in our project.
I will later check the points in http://www.kendoui.com/forums/ui/general-discussions/how-to-fix-the-foucing-menu.aspx