objective c - NSMenu update title -

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i have created nsmenu dynamically created , lists hdd's attached computer. each of these submenu contains nsmenuitem created title "calculating size...". on thread enumerating through specific folders return string replace title.

i have setup correctly if have 1 of these submenu's selected when enumeration finishes doesn't reflect change in title until either highlight item or select different submenu , come back.

what correct way of achieving update?


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