Этот "метот" надо искать не на форуме, а в документации:
Цитата:
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Сообщение от AS3 API Reference
DisplayObjectContainer.contains()
 Код AS3:
public function contains(child:DisplayObject):Boolean
Determines whether the specified display object is a child of the DisplayObjectContainer instance or the instance itself. The search includes the entire display list including this DisplayObjectContainer instance. Grandchildren, great-grandchildren, and so on each return true.
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