code: protected void renderColumnHeaderCell(FacesContext facesContext, ResponseWriter writer, UIColumn uiColumn,
          String headerStyleClass, int colspan) throws IOException
      {
          renderColumnHeaderCell(facesContext, writer, uiColumn, uiColumn.getHeader(), headerStyleClass, colspan);
      }
docs: Renders the header facet for the given <code>UIColumn</code>.
  @param facesContext the <code>FacesContext</code>.
  @param writer the <code>ResponseWriter</code>.
  @param uiColumn the <code>UIColumn</code>.
  @param headerStyleClass the styleClass of the header facet.
  @param colspan the colspan for the tableData element in which the header facet
  will be wrapped.
  @throws IOException