In various situations there seems to a need to
find out whether an object is Lookupable or not.
This is not needed for our own classes where we
can always add getLookup method, but for example
if we want to check if a component is Lookupable,
then a interface

interface Lookup.Provider {
  public Lookup getLookup ();
}

could be very handy. I suggest to create such
interface. It should be needed by actions redesign
done by Dafe and possibly by settings enhancements
being worked on by Honza.

There already was a discussion about this on nbdev:
http://www.netbeans.org/servlets/ReadMsg?msgId=329118&listName=nbdev