/**
* @private
* When the source list is replaced, reset.
*/
mx_internal function reset():void
{
internalRefresh(false);
if (dispatchResetEvent)
{
var event:CollectionEvent =
new CollectionEvent(CollectionEvent.COLLECTION_CHANGE);
event.kind = CollectionEventKind.RESET;
dispatchEvent(event);
}
}

public function refresh():Boolean
{
return internalRefresh(true);
}

Notice that calling the refresh() method merely calls internalRefresh() — just like the reset() function does (which gets called when you change the source).

Very useful,

Umair