Menu:AddBar(cName,bAction,bPreBlock,bPostBlock): public: return true
  Next item to bar line of the menu (the top line) is added. For every item
  is created a hot key after the character marked with ~ prefix.

  Parameter description:
  ~~~~~~~~~~~~~~~~~~~~~~
  cName: character: no default
   Menu item name

  bAction: code_block: default is the submenu for this item
   The code block, if not defined, the submenu for this bar item is created,
   if defined it represents the action processed when this item is selected.

  bPreBlock: code_block: default is {||true}
   The code block, processedd before entering this item.

  bPostBlock: code_block: default is {||true}
   The code block processed imediately after leaving the item.