
When menu editor is entered say with double clicking the toplevel
window:

vTcl:edit_target_menu in lib_core.tcl.
      vTclWindow.vTclMenuEdit in menus.tcl
         initProperties
             discoverOptions which creates a dummy menu and obtains
                 the configuration of each entry type.
             Fills in disabled entry for each option even if it is not
                 applicable.


         fill_menu_list the left hand side and initializes it with
		        <menu>.





When a menu item is added to the left:
     ::menu_edit::new_item in menus.tcl the item is added to the menu
	    fill_menu_list adds the itemt to the left hand side