An leaf items on a menu, used to both display menus and dispatch calls to jsps.
WARNING These are generally Global (ie final values), see WGlobalState.
Do not modify them on a per page basis, but do refer to them using
WPageStructure.getPageItem etc. in case there are local coplies.
isAccessible() Needed for JSPs to grey out menu items -- geters cannot have parameters.
We also allow for the possibility that Menus are not associated directly with pages.
We make a special case of the successItem to go to when a crud form is successful.
For all other links are encoded within the pages themselves.
We do not want to add a Struts-like extra level of indirection in general.
But for this common case we want to be able to return to the "caller" which may change.
(Maybe this should be changed later?)
Needed for JSPs to grey out menu items -- geters cannot have parameters.
We also allow for the possibility that Menus are not associated directly with pages.