Mnu:InsBlock: public: code_block
  This code block is activated from Mnu:Process() only when the Mnu:CanAppend
  is true and when the user pressed the Ins key. As parameter to this code
  block is passed the self object. The task for the code block is to append
  a new item to Mnu:Items(), or to change the instvar variables of this
  object. The menu items can be added/deleted an the menu can be dynamicaly
  changed during of the selection.