protected override void OnMouseDown(MouseEventArgs e)
 {
     base.OnMouseDown(e);
     if (DropDownMenu != null)
     {
         DropDownMenu.GetContextMenu().Show(this, new Point(0, Height));
     }
     else
     {
         IsPressed = true;
     }
     Invalidate();
 }
        protected override void OnClick(EventArgs e)
        {
            if (!lockClick)
            {
                lockClick = true;
                if (DropDownMenu != null)
                {
                    DropDownMenu.GetContextMenu().Show(this, new Point(0, Height));
                }
                if (style == ToolBarButtonStyle.PushButton)
                {
                    Pushed = !Pushed;
                }

                base.OnClick(e);
            }
        }