CellRenderer is not displaying icons in a loaded swf, throws null child addChildAt

I'm working with a component that extends List. It works fine unless it's loaded into another swf.
It cannot find the library symbols. I know the symbols exist in the loaded swf.
Is there a quick fix to this?

I have the component in the top level also,
I get this error:
TypeError: Error #2007: Parameter child must be non-null.
          at flash.display::DisplayObjectContainer/addChildAt()
          at fl.controls::BaseButton/drawBackground()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\controls\BaseButton.as:615]
          at fl.controls::LabelButton/draw()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\controls\LabelButton.as:724]
          at fl.core::UIComponent/drawNow()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\core\UIComponent.as:1343]
          at fl.controls::List/drawList()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\controls\List.as:594]
          at fl.controls::List/draw()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\controls\List.as:474]
          at .tree::TreeList/draw()
          at fl.core::UIComponent/callLaterDispatcher()[C:\Program Files (x86)\Adobe\Adobe Flash CS5\Common\Configuration\Component Source\ActionScript 3.0\User Interface\fl\core\UIComponent.as:1532]
I've checked the definitions for the tree component,
The LabelButton and List I don't have much control over.
I'm not sure how to fix this. The xml is correct and loads easily if it's in the root document.
The list component doesn't load the labels, It stops on the first one.
What do I do next?

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