show only in the first row in crystal reports details section

i have a crystal report and there is a field in details section which currently s开发者_StackOverflow中文版howing for each row. what's the way to set this field to show only once on the very first row?

Right-click on the field in Report Designer, select Format Field..., click on the Common tab in the Format Editor dialog, click on the conditional suppression button (the box marked x-2 to the right of Suppress) and enter the formula RecordNumber > 1 . Click Save and close to exit the Suppress Format formula editor, then click OK to exit the Format Editor.