private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
tm.ApplyDefaultResource(Application.Current.Resources, "system", new[] { "Themes/Dictionary1.xaml" });
tm.ApplyResource(Application.Current.Resources, new ThemeGroup("system", new[] { new ResourceDictionary()
{
Source = new Uri("pack://application:,,,/Gsof.Xaml.Demo;component/Themes/Dictionary2.xaml")
}, }));
}