actionscript 3 - What is the mnemonic index in the context of an application menu? -

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i have menu bar across top of application , each of menu items has property on called mnemonic index. it's value -1. documentation provide help. mnemonic index in relation menu item , for?

the environment i'm working in flex , adobe air. it's property on nativemenu , nativemenuitem.

a mnemonic single key, not used in combination ctrl, alt, or shift keys, activates menu command in open menu. character in menu item on windows contain underscore, i.e. r, g, b:

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menu item mnemonics relevant on windows, os-x not support mnemonics in menu items.

note: know on windows 7 (and under) supported, not sure if supported (show) under windows 8.1/10:

enter image description here

enter image description here

    var root:nativemenu = new nativemenu();     var stackroot:nativemenuitem = root.addsubmenu(new nativemenu(), "stack");      var stack:nativemenu = new nativemenu();     stackroot.submenu = stack;      var overflow1:nativemenuitem = new nativemenuitem("overflow1");     overflow1.mnemonicindex = 1;     overflow1.keyequivalent = "a";     overflow1.addeventlistener(event.select, selectcommand);     stack.additem(overflow1);      var overflow2:nativemenuitem = new nativemenuitem("overflow2");     overflow2.mnemonicindex = 2;     overflow2.keyequivalent = "b";     overflow2.addeventlistener(event.select, selectcommand);     stack.additem(overflow2);      var overflow3:nativemenuitem = new nativemenuitem("overflow3");     overflow3.mnemonicindex = 3;     overflow3.keyequivalent = "c";     overflow3.addeventlistener(event.select, selectcommand);     stack.additem(overflow3);      if (nativeapplication.supportsmenu) {         nativeapplication.nativeapplication.menu = root;     } else {         stage.nativewindow.menu = root;     }

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