/**
* Adds a child DisplayObject to this Container.
* The child is added after other existing children,
* so that the first child added has index 0,
* the next has index 1, an so on.
*
* <p><b>Note: </b>While the <code>child</code> argument to the method
* is specified as of type DisplayObject, the argument must implement
* the IUIComponent interface to be added as a child of a container.
* All Flex components implement this interface.</p>
*
* <p>Children are layered from back to front.
* In other words, if children overlap, the one with index 0
* is farthest to the back, and the one with index
* <code>numChildren - 1</code> is frontmost.
* This means the newly added children are layered
* in front of existing children.</p>
*
* @param child The DisplayObject to add as a child of this Container.
* It must implement the IUIComponent interface.
*
* @return The added child as an object of type DisplayObject.
* You typically cast the return value to UIComponent,
* or to the type of the added component.
*
* @see mx.core.IUIComponent
*
* @tiptext Adds a child object to this container.
*/
override public function addChild(child:DisplayObject):DisplayObject
{
return addChildAt(child, numChildren);
/*
addingChild(child);
if (contentPane)
contentPane.addChild(child);
else
$addChild(child);
childAdded(child);
return child;
*/
}
