protected virtual void OnExecuted(ExecutedEventArgs e)
        {
            EventHandler <ExecutedEventArgs> handler = Executed;

            if (handler != null)
            {
                handler(this, e);
            }
        }
 protected virtual void OnExecuted(ExecutedEventArgs e)
 {
     EventHandler<ExecutedEventArgs> handler = Executed;
     if (handler != null) handler(this, e);
 }