R1 = Pointer to menu structure, or window handle, or -1 to close menus
R2 = Menu X
R3 = Menu Y
Exactly the same as Wimp_CreateMenu, except that the parameters are
stored so that, after you have processed the selection, if the user
clicked ADJUST you can call WimpExt_ReCreateMenu to reopen the menu,
or this can be done for you (see WimpExt_Initialise).
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