Components show statusbar on Fullscreen apps

[MitjaHenner]

When I open a Dialog or move a Slider it shows the Android statusbar.
Im using:
item name="android:windowNoTitle">true
item name="windowActionBar">false
item name="android:windowFullscreen">true
item name="android:windowContentOverlay">@null
in my Theme and it works fine with normal Dialogs/seekbars and so on.