ListBoxCreateWidgetFunc    
    Called for list boxes that are bound to a GListModel with gtk_list_box_bind_model() for each item that gets added to the model.
If the widget returned is not a #GtkListBoxRow widget, then the widget will be inserted as the child of an intermediate #GtkListBoxRow.
- param - itemthe item from the model for which to create a widget for
- return a - GtkWidgetthat represents @item