GetMenuHandleFromPopUp

To get a handle to a popup menu from a PopUp menu control use the GetMenuHandleFromPopUp.

Note: This function does the same as PopUpMenu.MenuHandle, but PopUpMenu.MenuHandle is
not reccomended while the RB Plugin SDK has bugs which might create link errors
at compile time.

FUNCTION GetMenuHandleFromPopUp(ctrl as PopUpMenu) as MenuHandle

Supported platforms:
* MacOS PPC
* MacOS Carbon
* MacOS 68k
Unsupported platforms:
* Windows x86