ios7 - UIWindow shows the status bar - can't make it go away -

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i have ios 7 app.
uses key view controller-based status bar appearance set yes each view controller controls appearance of status bar.
of course, in case ios ignores calls uiapplication's setstatusbarhidden: , it's variants.
problems starts when show uiwindow on uiviewcontroller sets status bar hidden.
uiwindow becomes visible, status bar appears, , can't hide it.

assuming status bar hidden using -(bool)prefersstatusbarhidden , run following piece of code, status bar re-appears, , can't turn off.
suggestions, anyone?

    static uiwindow* w = nil; // testing code, makes sure w not autodestruct...     if (!w){         cgrect r = [[uiscreen mainscreen] bounds];         w = [[uiwindow alloc] initwithframe:r];         w.backgroundcolor = [uicolor greencolor];     }     [w makekeyandvisible]; // colors screen green, shows status bar


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