docs: public CrosstabBuilder addColumn(String title, String property, String className, boolean showTotal,
  			Style headerStyle, Style totalStyle, Style totalHeaderStyle) {
  		DJCrosstabColumn col = new CrosstabColumnBuilder()
  		.setProperty(property,className)
  		.setShowTotals(showTotal)
  		.setTitle(title)
  		.setHeaderStyle(headerStyle)
  		.setTotalHeaderStyle(totalHeaderStyle)
  		.setTotalStyle(totalStyle)
  		.build();
  		addColumn(col);
  		return this;
  	}