The Widget class has a getLookup() method but not implements Lookup.Provider.
This should be added even if the lookup is not used anywhere.

Related discussion can be found at bug 209609

A uses I see for lookup is the same kind of uses as for a Node.
1) With a constructor where you can pass the lookup, you can for example provide actions, border, layout.

2) An action can use the layout to find out if a given functionality is supported by the widget (rotating it,...)


Only thing to be changed in Widget.java is 

public class Widget implements Accessible {
by
public class Widget implements Accessible, Lookup.Provider {

I can supply a patch if needed.