gwt show value of texbox

   
i need to show the value inserted into texbox i create this code

public void onModuleLoad() {
         TextBox textValue = new TextBox();
         textValue.getSelectedText();
        final String index = textValue.getValue().toString();


         Button button = new Button("button", new ClickHandler() {
              public void onClick(ClickEvent event) {
                 
                  Window.alert("You selected: " + index);

                }
              });

         RootPanel.get().add(textValue);
         RootPanel.get().add(button);

    }
}

but into window not appears the value

can help me?

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