gtk-sharp 2.12.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. System.Delegate `` `` `` `` System.Boolean To be added. To be added. To be added. To be added. A delegate for specifying the shape of functions passed as parameters to . To be added. This function will get called on select and unselect of widget text. It should return if the state of the tree node may be toggled and if the state of the node should not be changed.