listbox similar to manage labels in gmail

I have a need to create a drop-down similar to "Move to" or "Labels"
buttons in gmail. I would like append "manage values" to a list in
drop down. When user selects manage values I would like to show a
settings panel. I am wondering if this kind of widget exists or if I
need to create a custom widget. I would appreciate any suggestions or
pointers. Thanks.

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.