I have a selection widget with several items that happen to be names of different models, on selecting a model, I want to trigger an act_window based on that model so how can we trigger an action from on_change function?

As far as I'm aware, it only reads "value", "domain" and "warning". I want similar functionality to a button "type=object" where we can simply return the action and everything works fine but I'm having no luck reproducing this from an on_change method.