Extend the AssetEditorStackSkin

The AssetEditorStackSkin provides the skin for the host component AssetEditorsStack. This component defines the various editors in the Asset Manager. Extend the AssetEditorStackSkin to include the custom LetterEditor. Create an AssetEditorStackSkin for the Host Component AssetEditorStack, for example, ExtendedAssetEditorStackSkin for the host component 'com.adobe.solutions.cmg.manage.presentation.AssetEditorsStack', creating a copy of 'com.adobe.solutions.cmg.manage.skins.AssetEditorsStackSkin':

Modify the generated skin to add the fx:Declaration:
<fx:Declarations> 
    <fx:Component id="letterEditor"> 
        <customizations:ExtendedLetterEditor/> 
    </fx:Component> 
</fx:Declarations>
add the XML namespace:
xmlns:customizations="com.adobe.customizations.*"

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