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If there is an object in the project (displayed by the look for DataObject), I would like to add properties or actions to it, change its icon etc. This could be done by the original look being a composite look, and then I would be able to add looks to its namespace, however as I understand it (from private discussion with Vita), this is not the situation now.
Fixed. Register your extensions to Looks/Composites/org-openide-loaders-DataObject Looks/Composites/org-openide-loaders-DataFolder folders.