WPF

<ctl:YesNoButton x:Name="showProgessOnDesktop" IsYes="{Binding Mode=TwoWay, Path=ShowOnDesktop, Source={x:Static c:Preferences.Instance}}"/>

public bool IsYes

{

    get { return (bool)GetValue(IsYesProperty); }

    set

    {

        SetValue(IsYesProperty, value);

        no.Foreground = (value) ? Brushes.LightGray : Brushes.Black;

        yes.Foreground = (value) ? Brushes.Black : Brushes.LightGray;

    }

}



public static readonly DependencyProperty IsYesProperty =

    DependencyProperty.Register("IsYes", typeof(bool), typeof(YesNoButton), new UIPropertyMetadata(false));

mainWindow.DataContext = viewModel;

lt;Button Grid.Row="1" HorizontalAlignment="Right" Margin="0,3,18,3" Name="button1" Width="110" 
                Command="{Binding LoadCommand}">_Load</Button>

/// <summary>
        /// Gets the load command.
        /// </summary>
        /// <value>The load command.</value>
        public ICommand LoadCommand
        {
            get
            {
                if (m_LoadCommand == null)
                {
                    m_LoadCommand = new RelayCommand(param => CanLoad(), param => Load());
                }

                return m_LoadCommand;
            }
        }

//hook up event listeners on the actual UserControl instance
            this.ucCustomEvent1.CustomClick += new RoutedEventHandler(ucCustomEvent_CustomClick);
            //hook up event listeners on the main window (Window1)
            this.AddHandler(UserControlThatCreatesEvent.CustomClickEvent, new RoutedEventHandler(ucCustomEvent_CustomClick));

// Load the skin file and wire up event handlers.
private void LoadSkin(string skin_file)
{
  // Load the controls.
  FrameworkElement element =
  (FrameworkElement)Application.LoadComponent(new Uri(skin_file, UriKind.Relative));
  this.Content = element;
  // Wire up the event handlers.
  Button btn;
  Polygon pgn;
  Rectangle rect;
  Grid grd;
  Ellipse ell;
  switch (element.Tag.ToString())
  {
    case "Red":
      btn = (Button)element.FindName("btnRepairDisk");
      btn.Click += new RoutedEventHandler(btnRepairDisk_Click);
      //Code for other controls omitted
    break;
    case "Blue":
      //Lots of code omitted
      // Uses the same event handler as rectMove.
      ell = (Ellipse)element.FindName("ellMove");
      ell.MouseDown += new System.Windows.Input.MouseButtonEventHandler(rectMove_MouseDown);
      grd = (Grid)element.FindName("grdExit");
      grd.MouseDown += new System.Windows.Input.MouseButtonEventHandler(grdExit_MouseDown);
    break;
  }
}