The PopMenuBar XFCN allows you to add Pop Up Menu Bars to your stack. By using this feature you can get around Hypercard's limitation of not being able to customize the Menu Bar. Try it out now:
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Command Structure:
PopMenuBar(menuID#1,menuID#2,...,menuID#10)
menuID#n: id of menu resource to be added to Pop Up Menu Bar .
Note: You can add up to 10 menus to the Menu Bar. Menu Ids should be greater than 12 (ids 1 to 12 are used for Hypercard's Menu Bar).
Values returned by PopMenuBar:
-1 => PopMenuBar was called without any parameter or with more     than 10 parameters.
-2 => Illegal Menu Resource ID ( It should be greater than 12 ) .