code: private void setupUI() {
  		add(new WMessageBox(WMessageBox.WARN,
  				"This example is for framework testing ONLY and must not be used as an example of how to set up any UI controls"));
  		WFieldLayout layout = new WFieldLayout();
  		add(layout);
  
  		layout.addField("Select an option with spaces", drop);
  		layout.addField(submit);
  		add(new ExplanatoryText("In the result output space characters are replaced with '%20'."));
  		add(new WHeading(HeadingLevel.H2, "Result Text"));
  		add(text);
  	}
docs: Add controls to the UI.