I'm experiencing an issue in windows with contenttemplate and inside a toolbar with toolbarsplitbutton.
Normally the control work fine but if I maximize the window i cannot expand anymore the splitbutton
I built up a test demo based on your code and as far as I understand and see from my demo the problem is that the dropdown is shown below the maximized RadWindow. This happens because the maximized RadWindow gets a very big z-index by design in order to be shown above everything on the page.
I can suggest to manners to get the behavior you desire:
1) Set ShowOnTopWhenMaximized=false for the RadWindow
2) Set big z-index to the toolbar, e.g as shown below:
I tested both the solutions and they worked on my side. Please, test them on your side and let me know how it goes.
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