To use this component put this in your .java file:

public ERXDateGrouper aGrouper = new ERXDateGrouper();

and bind aGrouper in your WOD:

 
<webobject name = "monthView"></webobject>

 
monthView : ERXMonthView {
  grouper = aGrouper;
}

The result is a nice little calendar component that you can further customize (a year display was added to this one).