Creates a new GtkDropDown.
You may want to call [method@Gtk.DropDown.set_factory] to set up a way to map its items to widgets.
the model to use or %NULL for none
the expression to use or %NULL for none
a new GtkDropDown
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new GtkDropDown.
You may want to call [method@Gtk.DropDown.set_factory] to set up a way to map its items to widgets.