Not change the color fo the application in WP8 c#

Question

In my setting page I have a listPicker control, that have two values Dark and Light when I select Dark from listpicker I want to change background to Silver foreground color to white buttons background color to Black , buttons foreground color to white and accentcolor is black of the application, and I am doing like below:

private void themelistPicker1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ListPickerItem lpi = (sender as ListPicker).SelectedItem as ListPickerItem;
            themename = lpi.Content.ToString();
            if (themename == "Dark")
            {
                SolidColorBrush brush = new SolidColorBrush();
                brush.Color = Color.FromArgb(255, 192, 192, 192);
                App.RootFrame.Background = brush;

                ((SolidColorBrush)Resources["PhoneAccentBrush"]).Color = Colors.Black;
                ((Color)Resources["PhoneForegroundColor"])= Colors.Black;
            }
            else 
            {
                SolidColorBrush brush = new SolidColorBrush();
                brush.Color = Color.FromArgb(255, 255, 255, 255);
                App.RootFrame.Background = brush;

                ((SolidColorBrush)Resources["PhoneAccentBrush"]).Color = Colors.Blue;
                ((Color)Resources["PhoneForegroundColor"])= Colors.Black;
            } 

But it changes only the background and accentcolor color of the setting's page not all the application and also not change the foreground and buttons color of the application, why?

Kindly suggest me, waiting for reply.

Thanks

Answer 1

For doing this, define in App.xaml your custom SolidColorBrushes and then set them as Background/Foreground to all your controls. Then just change those Brushes and it will change all the controls.

Do not change colors to the system defined brushes, because all controls use them. That is why your code changes things you don't want to be changed.