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I am trying to give a custom css class to message that is displayed when there are no data rows displayed in "rich:extendedDataTable".
Text that is displayed in these case can be set using "noDataLabel" property of rich table, but i did not find the css style which format these output.
Use the rendered condition to display the table. And also include one more panelGroup or panelGrid with rendered condtion which actully contains the message which you want to display.