o:additem( <oItem> ) -> < undefined >

------------------------------------------------------------------------------

 PARAMETER:

  <oItem>      TMSGITEM Object that will be added to the message bar 


 DESCRIPTION:

  FiveWin's Message bar class allows you to create your own message bar 
  item's with the DEFINE MSGITEM command. 
  This method is used internally to attach the Item to the aItem Array 
  and update the message bar.