[Vala] Inheriting Gtk.ListStore

[Simon Chan <simon780 gmail com>]

I am trying to inherit ListStore object, but with no success.

It's complaining the following message when I compile
"undefined reference to `gtk_list_store_construct'"

Does anyone know how to inherit vala object?

vala version: 0.7.5

class CustListStore : Gtk.ListStore {

    public CustListStore (Type[] types) {
        base.newv(types);
    }

}