public void ListSelection () {
        _view.ls_products.setSelectionModel(new DefaultListSelectionModel() {
            @Override
            public void setSelectionInterval(int index0, int index1) {
                if(_view.ls_products.isSelectedIndex(index0)) {
                    _view.ls_products.removeSelectionInterval(index0, index1);
                } else {
                    _view.ls_products.addSelectionInterval(index0, index1);
                }
            } 
         });
    }