code: private void buildSubordinatePanel(final WDropdown dropdown, final String value,
  			final WComponentGroup<SubordinateTarget> group,
  			final WSubordinateControl control) {
  		// create the panel.
  		WPanel panel = new WPanel();
  		WStyledText subordinateInfo = new WStyledText();
  		subordinateInfo.setWhitespaceMode(WhitespaceMode.PRESERVE);
  		subordinateInfo.setText(value + " - Subordinate");
  		panel.add(subordinateInfo);
  
  		// add the panel to the screen and group.
  		infoPanel.add(panel);
  		group.addToGroup(panel);
  
  		// create the rule
  		Rule rule = new Rule();
  		control.addRule(rule);
  		rule.setCondition(new Equal(dropdown, value));
  		rule.addActionOnTrue(new ShowInGroup(panel, group));
  	}
docs: Builds a panel for the subordinate control, including the rule for that particular option.
  
  @param dropdown the subordinate trigger.
  @param value the dropdown option to be added
  @param group the group
  @param control the subordinate control