[R] WinMenus - is there a way of knowing if a WinMenu or WinMenuItem already exists?

[Finn Sando]

I am developing a menusystem using the functions WinMenuAdd and 
WinMenuAddItem etc. 

I want to be able to shift between different interfaces (ie. different sets of menu-trees).
Therefore I would like to be able to ask whether a specific menu already exists in order 
to remove or add it Without errors. That is I am looking for something like:

WinMenuExist(menuname) and WinMenuExistItem(menuname,itemname)

Are there any way asking such question of R?
--
Finn