code: public void addHasFeature(HasFeature hasFeature) {
  		widget.addHasFeature(hasFeature);
  
  		if (hasFeature instanceof Widget) {
  			panel.insert((Widget) hasFeature, panel.getWidgetCount() - 1);
  		}
  	}
docs: Add a {@link HasFeature} to the feature info widget. This will typically
  be an action to interact with the feature (info). If the HasFeature is a widget
  it will be added to the panel.
  
  @param hasFeature The HasFeature to add.