text field on radio listener help

[malen]

Hi! I am trying to add a text field upon clicking a radio button but it doesn't seem to work. What I want to do is display different text fields depending on the radio button clicked. It prints the message "done" but it won't load/add the textfield. Am I missing some code? What do I need to add to this to make it work? What is rendering, is it what I need to do? Thank you.

public class Upload {

    Widget page = new Widget();
    final FormPanel mainPanel = new FormPanel();
    
    public Uploasd(String wholeName, final int user_id, final int schId) {
        mainPanel.setHeading("Upload Work");
        mainPanel.setEncoding(Encoding.MULTIPART);
        mainPanel.setMethod(Method.POST);
        mainPanel.setWidth(775);
        FormLayout fLayout1 = new FormLayout();
        fLayout1.setLabelWidth(110);
        fLayout1.setPadding(5);
        mainPanel.setLayout(fLayout1);
        
        FileUploadField file = new FileUploadField();  
        file.setAllowBlank(false);  
        file.setFieldLabel("File");
        mainPanel.add(file);
        
        RadioGroup license = new RadioGroup("privacy");  
        license.setFieldLabel("Privacy");  
        license.add(radio);  
        license.add(radio2);  
        license.add(radio3);
        mainPanel.add(license); 
        
        final Radio tList = new Radio();
        tList.setWidth(120);
        tList.setName("assess");
        tList.setId("2");
        tList.setBoxLabel("from list");
        tList.setToolTip("choose from the complete list of evaluators in the system");
        tList.setValue(true);  
        
        final Radio rubric = new Radio();  
        rubric.setName("assess"); 
        rubric.setId("1");
        rubric.setItemId("1");
        rubric.setWidth(120);
        rubric.setToolTip("choose from teachers with the specified rubric keyword");
        rubric.setBoxLabel("with rubric...");
        rubric.setValue(false);
        
        RadioGroup assessors = new RadioGroup("evaluators");  
        assessors.setFieldLabel("Evaluators");  
        assessors.add(tList);  
        assessors.add(rubric);  
        mainPanel.add(assessors);
                
        final TextField testing1 = new TextField();
        testing1.setFieldLabel("Teacher's Name");
        testing1.setBorders(true);
        final HorizontalPanel testPanel1 = new HorizontalPanel();
        testPanel.add(testing1);
        
        final TextField testing2 = new TextField();
        testing2.setFieldLabel("Teacher's Name");
        testing2.setBorders(true);
        final HorizontalPanel testPanel2 = new HorizontalPanel();
        testPanel.add(testing2);

        tList.addListener(Events.OnClick, new Listener<FieldEvent>() {
            public void handleEvent(FieldEvent be) {                
                if (be.field.getId() == "2") {
                    mainPanel.add(testPanel);
                    System.out.println("done1");

                }        
            }
        });
        
         rubric.addListener(Events.OnClick, new Listener<FieldEvent>() {
            public void handleEvent(FieldEvent be) {                
                if (be.field.getId() == "1") {
                    mainPanel.add(testPanel2);
                    System.out.println("done2");

                }        
            }
        });
        page = mainPanel;
    }
    public Widget getWidget() {
        return page;
    }
    
}