private void DropAction(string str, Point mouse)
        {
            SmartEvent el = events.EventAt(mouse.X, mouse.Y);

            switch (dropResult)
            {
            case DropResult.INSERT:
                el.InsertAction(SmartFactory.GetInstance().ActionFactory(str), el.GetInsertActionIndexFromPos(mouse.X, mouse.Y));
                break;

            case DropResult.REPLACE:
                SmartAction action = (SmartAction)el.GetElementFromPos(mouse.X, mouse.Y);
                el.ReplaceAction(SmartFactory.GetInstance().ActionFactory(str), action);
                break;
            }
        }