code: public CrosstabBuilder setColumnStyles(Style headerStyle, Style totalStyle, Style totalHeaderStyle) {
  		crosstab.setColumnHeaderStyle(headerStyle);
  		crosstab.setColumnTotalheaderStyle(totalHeaderStyle);
  		crosstab.setColumnTotalStyle(totalStyle);
  		return this;
  	}
docs: Should be called after all columns have been created
  @param headerStyle
  @param totalStyle
  @param totalHeaderStyle
  @return