Change Background of WP7 Application if Theme is altered

Question

I need to change the Background Image of my Application if user changes theme from \"Light\" to \"Dark\" or vice-vesa in code behind. I hop

Answer 1

If your application is tombstoned, all your controls will be recreated and the new theme will be applied. If you'd like to manage your light/dark specific styles in a similar vein to normal themes, you might want to take a look at a custom ResourceDictionary I blogged about a while back.

Unfortunately, as of Mango there, is a bug (?) related to fast application switching that causes the theme to remain unchanged in your application. The bug is outlined in this question and its linked posts:

Is there a bug when changing themes when app is deactivated and reactivated in Windows Phone Mango

My ResourceDictionary is still useful for the initial startup but it appears, unfortunately, that nothing can be done to workaround the Mango bug.