bMenuSelect                Exported, Block, User
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   This Codeblock is called from the method MENUSELECT() when the
   Window receives a WM_MENUSELECT Message because the user selects
   a menu item.

   The block receives three parameter on evaluation:
   
   ItemSelect  referenz to the object of the selected menu item
               ( same as classVar omItemSelect )

   nFlags      menu Flags. See ->MenuSelect

   nHMenu      handle of the menu