Adobe Air: add NativeMenuItem to existing NativeMenu

If you want to add just a single (or more) custom NativeMenuItem on the your existing NativeMenu, you can do it without recreate all the NativeMenu structure.

Just write down something like:

// get the NativeMenu object
var nm:NativeMenu = NativeApplication.nativeApplication.menu

// I want to use the first menuItem, so use the index=0
var nm0:NativeMenuItem = nm.getItemAt(0)

// create the custom NativeMenuItem
var prefMenu:NativeMenuItem = new NativeMenuItem("Preferences...");
prefMenu.addEventListener(Event.SELECT, openPrefWin);
var separator:NativeMenuItem = new NativeMenuItem("separator", true);

// add it to our existing NativeMenu
// these menu will placed immediately after the 'About' menuItem
nm0.submenu.addItemAt(separator, 1)
nm0.submenu.addItemAt(prefMenu, 2)

That’s it