I noticed strange behaviour. Set white background in my application (e.g. for Grid LayoutRoot in xaml) and then expand keyboard clicking on input/Textbox on page. After this click button in ApplicationBar which redirects to another page (do NOT close the keyboard!) and for a little moment black background is displayed on the place where was keyboard and then I am redirected.
Does anybody experienced this behaviour? Any solution?
P.S. I really want my application to be with white background for every theme - dark/light.
P.S.2 There is a workaround for appbar flickering:
How can you prevent the ApplicationBar flickering on the WP7 white theme?