How can be the default page settings changed for a silverlight page ?

Answer:

You can change the default page settings of a silverlight page.
This can be done by setting the RootVisual property in the Application_Startup event of the App.xaml file.
This is done as follows:

Private void Application_StartUp(object sender, StartupEventArgs e)

{

   this.RootVisual = new MainPage();

}