Conditionally display button based on number of rows in rpt query results?

I know that I can conditionally display a button based on the number of rows returned in a query entered in the condition. However, I have a report region button that I only want to display if any data was returned by a report query. Since I've already executed the query to generate the report, I do not want to execute it again to determine whether any rows were returned. Is there any way to detect whether any rows were returned for a report other than to reissue the query?

http://htmldb.oracle.com/pls/otn/f?p=24317:52
OK, so it looks like it contains the rowcount of the report region rendered just before the variable (apex_application.g_flow_total_row_count) is referenced.
Sort of like how SQL%ROWCOUNT contains the no. of records affected by the last SQL DML statement.
Note that the pagination scheme affects the result. In the example above, the 2nd report region is showing 10 rows with a 'Rows X to Y' pagination scheme. So g_flow_total_row_count=11 because I guess the reporting engine has to fetch the 11th row (and discard it) to determine whether to render the 'Next' pagination link.
If you select a pagination scheme that forces the reporting engine to fetch all the rows 'Rows X to Y of Z', g_flow_total_row_count will always be Z, not the number of rows actually rendered on the screen.
Thanks

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http://danielmcghan.us
http://sourceforge.net/projects/tapigen
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Conditionally display button based on number of rows in rpt query results?

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