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Читаем хэлп:

Returns an array of objects that lie under the specified point and are children (or grandchildren, and so on) of this DisplayObjectContainer instance. Any child objects that are inaccessible for security reasons are omitted from the returned array. To determine whether this security restriction affects the returned array, call the areInaccessibleObjectsUnderPoint() method.

Т.е. возвращать он должен детей,так?Пишу

var objs:Array = cont.getObjectsUnderPoint(new Point(stage.mouseX, stage.mouseY));
trace(objs[0]==cont); //true

Самое интересное, что в objs вообще нет того, над чем мышь находится