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Container like Group of DataObjects usually needs to customize look of its children, e.g. it needs to add Remove action to context menu of each child. This can't be done by customizing look registered for the child's class, because that would add Remove action to all instances and not to only those which are childs of the Group. There is no way how to write looks for such container using current Looks API.
See also requirement A3 in http://projects.netbeans.org/proposals/looks/index.html
The supported way is to create wrappers for all child object of the container, return those wrappers as children of container, register Look for the wrapper's class and within this Look to delegate to the Look of wrapped object (and to add Remove action or do whatever is needed). This seems to be sufficient for projects, so marking as FIXED.
Reopening, the way described in my last comment doesn't work in general, because the wrapper's Look needs to get availableLooks for original represented object (in order to wrap all Looks registered for this represented object). So, the wrapper's Look needs to know the baseLook in order to ask it for availableLooks.
Moving Looks issues to dev 4.0
added keyword PROJECTS, because we need to distinguish issues against NB4.0 and S1Sx.y
Should be done by creating own LookSelector. I.e. the selector will return decorated looks for object with given property set and undecorated for those where the property is not set.
verifying.