Change Style to all pages in Silverlight

Hi,
  I have created some styles for silverlight controls in App.xaml...  but these selected style should apply to an entire application.. this is working only on current page...

These links might help you in understanding how and why to use app.xaml for styles.

weblogs.asp.net/scottgu/pages/silverlight-tutorial-part-4-using-style-elements-to-better-encapsulate-look-and-feel.aspx
www.dotnetspider.com/Silverlight-Tutorial-304.aspx
-Mamta

Hi,
 How to create  global level resource for the stylen in App.xaml .. could you explain...

Create a global level resource for the stylen in App.xaml and apply it when the combo box is selected.
-Mamta