code: protected void onEditTitleTextBox(TextBox box) {
  
          if (m_titleEditHandler != null) {
              m_titleEditHandler.handleEdit(m_title, box);
              return;
          }
  
          String text = box.getText();
          box.removeFromParent();
          m_title.setText(text);
          m_title.setVisible(true);
  
      }
docs: Internal method which is called when the user has finished editing the title.
  
  @param box the text box which has been edited