How to cancel selection for TreePanel(GXT)

treePanel.getSelectionModel().addListener(Events.BeforeSelect, new Listener<SelectionEvent<ModelData>>() {

            @Override
            public void handleEvent(SelectionEvent<ModelData> be) {
                // Get the model data
                ModelData model = be.getModel();

               // Check the model data and if want to cancel selection, then set canceled value
                if (model.get("disableSelect") != null) {
                    be.setCancelled(true);
                }
            }
        });