[Flex] Event Handling 2

a.mxml -> parent
b.mxml -> sub

============== b.mxml ==================
[mx:Metadata]
[Event(name="settingOver", type="flash.events.Event")]
[/mx:Metadata]
..
..
..

var e:Event = new Event("settingOver");
this.dispatchEvent(e);
..
..
============== a.mxml =====================
var _b:b;
_b.addEventListener("settingOver", settingOverFunction);
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public function settingOverFunction(e:Event):void
{
// do something
}