When I set full screen mode in landscape mode using CCoeControl::SetExtentToWholeScreen(), some kind of window becomes visible at the position of the toolbar buttons between the Back and the Options softkeys. This windows is above my appview.

The same app on the regular emulator doesn't show this behaviour. It looks like this window is there to hide toolbar buttons that could shine through the toolbar of the current app (I reported in that issue earlier).

The result is that I now cannot push the buttons on my own toolbar as these are hidden behind this floating window.