Thanks for your reply! A Picker using MenuPickerStyle was what I was referring to as not supporting common NSPopUpButton (menu) features like separators and disabled items. So unfortunately, that's not a solution.

Thanks for your reply! Actually, a Picker using the MenuPickerStyle is what I was referring to as not supporting common NSPopUpButton (menu) features like separators or disabled items. So unfortunately, that doesn't solve the problem.