(^1) Add an Open menu item under File, by selecting File then clicking the New Menu
Item button in the toolbar. A temporary numbered menu item label, Untitled,
appears.
(^2) Fill in the Text and Tag fields for the new menu item. For example, set Text to Open
and set Tag to menu_file_open. Click outside the field for the change to take effect.
6 Lay Out a UI Using GUIDE
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