code: protected String[] getRowClasses(PanelGrid grid) {
  		String rowClasses = grid.getRowClasses();
  		if (null == rowClasses || rowClasses.trim().length()==0)
  			return null;
  		String[] rows = rowClasses.split(",");
  		return rows;
  	}
docs: Extract the option row classes from the JSF file.
  
  @return null or a String array.