Multi select combo box feature in gxt

How can I actually create a multi select combo box featuring gxt gwt only. If this how the combo box is created, then how to create multi select combo box?

idStore = new ListStore<Category>(new ModelKeyProvider<Category>() {

            @Override
            public String getKey(Category item) {
                return item.getIdcategory() + "";
            }
        });
        idStore.addAll(list);

        cmbCat = new ComboBox<Category>(idStore, new LabelProvider<Category>() {

            @Override
            public String getLabel(Category item) {
                return item.getStrName();
            }
        });

        cmbCat.addValueChangeHandler(new ValueChangeHandler<Category>() {

            @Override
            public void onValueChange(ValueChangeEvent<Category> event) {
                catId = event.getValue().getIdcategory();
            }
        });

        cmbCat.setValue(idStore.get(0));
        cmbCat.setAllowBlank(false);
        cmbCat.setForceSelection(true);
        cmbCat.setTypeAhead(true);
        cmbCat.setTriggerAction(ComboBoxCell.TriggerAction.ALL);

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