private void CloseAllDropDown()
 {
     foreach (ToolStripItem item in this.DisplayedItems)
     {
         QMenuItem item2 = item as QMenuItem;
         if ((item2 != null) && item2.Selected)
         {
             if (item2.HasDropDownItems && item2.DropDown.Visible)
             {
                 item2.HideDropDown();
             }
             this.miUnselect.Invoke(item2, null);
             break;
         }
     }
 }