I'm trying to add a ComboBox - set the store, and allow type-ahead, without allowing the user to enter new values. It appears that I can only have type-ahead when readonly=false and editable=true. However, editable=true seems to allow users to enter a new item into the combo box.

We had this working in GXT 1.5, but the 2.x seems to be working a little different?

Code:
public class MyTestEntryPoint implements EntryPoint {

    public void onModuleLoad() {
        VerticalPanel vp = new VerticalPanel();  
        vp.setSpacing(10);  
        createColumnForm(vp);  
        RootPanel.get().add(vp);
    }
    
    private void createColumnForm(VerticalPanel vp) {
        FormPanel panel = new FormPanel();

        List<Stock> stocks = TestData.getStocks();  
        Collections.sort(stocks, new Comparator<Stock>() {  
          public int compare(Stock arg0, Stock arg1) {  
            return arg0.getName().compareTo(arg1.getName());  
          }  
        });  
      
        ListStore<Stock> store = new ListStore<Stock>();  
        store.add(stocks);  
      
        final ComboBox<Stock> combo = new ComboBox<Stock>(){
            @Override
            public Stock getValue() {
                Stock returnVal = super.getValue();
                if(returnVal==null) {
                    Stock newStock = new Stock();
                    newStock.set( "name", getRawValue() );
                    newStock.set( "symbol", getRawValue() );
                    returnVal = newStock;
                }
                return returnVal;
            }
        };
        combo.setName( "name" );
        combo.setFieldLabel("Company");  
        combo.setDisplayField("name");  
        combo.setTriggerAction(TriggerAction.ALL);  
        combo.setStore(store);  

        combo.setAllowBlank( false );
        combo.setEditable( false );
        combo.setEmptyText( "Please choose a stock" );
        combo.setForceSelection( true );
        
        panel.add(combo); 
     
        
        Button submitButton = new Button( "Submit" );

        FormButtonBinding buttonBinding = new FormButtonBinding( panel );
        buttonBinding.addButton( submitButton );
        panel.add( submitButton );
      
        vp.add(panel);
        
      }  
}