Re: Extension-point and the notion of has content

[Lance Java]

I would probably give the side well an id in the HTML. Then you can inspect
the contents of the well in the afterRender method of your layout

void afterRender(MarkupWriter writer) {
  Element sideWell = writer.getDocument().getElementById("wellId");
  if (!sideWell.getChildren().isEmpty()) {
     // do stuff here
  }
}