Own commands for "Text Highlight Color" and "Font Color" buttons

Hello,

in your samples there is for Text Highlight Color:

<ribbon:SplitButton Command="sample:ApplicationCommands.ApplyDefaultForeground" KeyTipAccessText="FC"><StackPanel><ribbon:ColorPickerGallery InitialColumnCount="10" HorizontalAlignment="Center"
Command="sample:ApplicationCommands.ApplyForeground" IsPreviewEnabled="True"><ribbon:ColorPickerGallery.CategorizedItemsSource><x:Array Type="{x:Type media:SolidColorBrush}"><media:SolidColorBrush ribbon:PopupGallery.Category="Theme Colors" ribbon:ColorPickerGallery.LayoutBehavior="Shaded" Color="#FFFFFF" ribbon:ScreenTipService.ScreenTipHeader="White" /><media:SolidColorBrush ribbon:PopupGallery.Category="Theme Colors" ribbon:ColorPickerGallery.LayoutBehavior="Shaded" Color="#000000" ribbon:ScreenTipService.ScreenTipHeader="Black" /><media:SolidColorBrush ribbon:PopupGallery.Category="Theme Colors" ribbon:ColorPickerGallery.LayoutBehavior="Shaded" Color="#EEECE1" ribbon:ScreenTipService.ScreenTipHeader="Tan" /><media:SolidColorBrush ribbon:PopupGallery.Category="Standard Colors" Color="#7030A0" ribbon:ScreenTipService.ScreenTipHeader="Purple" /></x:Array></ribbon:ColorPickerGallery.CategorizedItemsSource></ribbon:ColorPickerGallery></StackPanel></ribbon:SplitButton>

The aplied command in the sample for this is:

		public static RibbonCommand ApplyDefaultBackground {
			get {
				if (applyDefaultBackground == null)
					applyDefaultBackground = new RibbonCommand("ApplyDefaultBackground", typeof(Ribbon), "Text Highlight Color", null, "pack://application:,,,/SampleBrowser;component/Resources/Images/TextHighlightColor16.png");				
				return applyDefaultBackground;
			}
		}

 This piece of code changes in the richtexbox the backgroud of the selected text. Also changes the fill color of litle rectangle below the icon.

My request is how can I use some own command? Because instead of richtextbox I have another control color to be changed after clicking this button. In my own command I would like to use also the TextHighlightColor16.png of the sample so the little rectangle can be updated after selecting some color from the picker color.

Thanks for your help.