FAQ.Errors.TypeError: Error #1034

If you are attempting to add a child to a mx.core.Container, the child must implement the interface mx.core.IUIComponent. Exactly 2 classes directly implement this interface. These are mx.core.UIComponent and mx.core.UITextField. Additionally, IAxisRenderer, IDeferredInstantiationUIComponent, IListItemRenderer, IMenuBarItemRenderer, IToolTip subclass IUIComponent so classes implementing these interfaces can be added to Containers as well. There are two ways to fix this problem:

1. Add the child component that you are trying to add to a UIComponent (or other component that implements IUIComponent) and then add the UIComponent to the Container.

2. Use a different child component. i.e. If the child was a Loader, use SWFLoader instead.