open fun onUnbind(listener: OnModelUnboundListener<GroupModel_!, ModelGroupHolder!>!): GroupModel_!open fun onUnbind(listener: OnModelUnboundListener<GroupModel_!, ModelGroupHolder!>!): GroupModel_!
Overrides GroupModelBuilder.onUnbind
Register a listener that will be called when this model is unbound from a view.
The listener will contribute to this model's hashCode state per the rules.
You may clear the listener by setting a null value, or by calling #reset()