Display submenu after receiving Message_MenuWarning
* R0 = handle of the submenu or zero for current menu
R1 ® block
* R0,R1 preserved
Use: This call may be used to display submenu when a message type MenuWarning (&400C0) is received by an application. This message is sent by the Wimp when submenu is about to be accessed by the pointer moving over the right-pointing arrow of the parent menu. (To find out the handle of the menu item in parent menu you can use MenuUtil_Decode).
R1 on entry must point to message block (in fact only two words at offsets +24 and +28 will be used).
Note: If you plan to use MenuUtil_Decode then all submenu pointers must be valid. It means that you have to link submenu pointed to by R0 with corresponding menu item. This can be done by MenuUtil_SubMenu.
Example code...
Example code (MenuUtil_ShowSubMenu)
Display fonts submenu on screen after receiving MenuWarning:
SYS "MenuUtil_SubMenu",fontsItem%,fontsMenu%
SYS "MenuUtil_ShowSubMenu",fontsMenu%,q%
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