ActionScript reference to grandchild (child of child) element

Question

Let's say I have some basic MXML setup as follows:

<Item id="parent">
    <Frame>
        <mx:Image/>
    </Frame>
</Item>

How can I refer to an attribute of the Image element by referring to it as a grandchild (child of a child) of the parent Item? I've tried daisy-chaining two calls to getChildAt(), i.e.:

parent.getChildAt(0).getChildAt(0)

But I get the following error:

Error: Call to a possibly undefined method getChildAt through a reference with static type flash.display:DisplayObject.

What is the proper way to make a call to a grandchild element?

Answer 1

getChildAt() function returns a DisplayObject

getChildAt()

So you must be type cast as follows.

DisplayObjectContainer(parent.getChildAt(0)).getChildAt(0)