Developing UI's in GNU/Smalltalk

Question

Which frameworks or packages exists for developing UI's with GNU/Smalltalk? There seems to be a GTK+ binding but not much documentation about it.

For example in VisualAge Smalltalk there is WidgetKit and in Squeak there is Morphic with Announcements or change/update event protocol. What would be their corresponding options in GNU/Smalltalk?

Answer 1

The GTK+ binding is the "official" way to develop UIs with GNU Smalltalk.