I am trying to debug this issue for last 2 days, I have tried all the solutions available on SO and Microsoft connect but can\'t seem to find any solution.
I downloaded
Did you search for PhoneProgressBarBackgroundBrush? It should show up in a Resource Dictionary. If you find it, I'd go make sure that Resource Dictionary is declared as a MergedDictionary in your app.xaml, if you can't find it, then you have the next troubleshooting question asked, as to whether it just needs added.
You can try putting something like this into a resource dictionary;
If you're not sure of what file holds your other brushes, a quick search for something like "