Spark Panel Skin + target topGroup?

Hey there- How do I addElement() to the topGroup of a Spark Panel component skin? For instance, if I create a custom UIComponent, then create an associative skin that uses the Spark Panel as a default, how do I add elements to the topGroup from with开发者_运维知识库in the skin? Thanks!

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Why didn't you inherit from Panel for your custom component?

1. Create a component that inherits from Panel
2. Declare a new SkinPart with a the same type as the element you want to add to the topGroup

3. Override the partAdded/partRemoved methods. In the partAdded, simply add the SkinPart defined to the topGroup. Something like :

   if (instance == yourSkinPartId) topGroup.addElement(yourSkinPartId)