void OnRadioLabelToggled(View view)
        {
            // Set Opacity to indicate toggled state.
            view.Opacity = view.GetRadioState() ? 1.0 : 0.5;

            // Possibly change the current color mode.
            if (view.GetRadioState ())
            {
                ColorMode newColorMode = 
                    (ColorMode) Enum.Parse (typeof(ColorMode), view.StyleId);

                if (currentColorMode != newColorMode)
                {
                    currentColorMode = newColorMode;
                    SetSlidersAndBindings ();
                }
            }
        }