protected virtual void TriggerEvent(PrimusUIEventArgs a)
 {
     if (Trigger != null)
     {
         Trigger(this, a);
     }
 }
        public override void Invoke()
        {
            PrimusUIEventArgs e = new PrimusUIEventArgs(_ID);

            e.UpdateType = 1; // 1= button press?
            TriggerEvent(e);
        }