private void SwitchImage(object sender, RoutedEventArgs e)
        {
            string senderName = ((Button)sender).Name;

            Receiver cmdReceiver = new Receiver();
            DisplayCatCommand cmd = new DisplayCatCommand(cmdReceiver);
            CmdExecutor executor = new CmdExecutor(cmd);

            executor.ExecuteCatCommand(senderName);
        }
 public DisplayCatCommand(Receiver cmdReceiver)
 {
     this.cmdReceiver = cmdReceiver;
 }