How to Change page footer section items in data binding(or data bound) event of a "Report" R3 2016

[M]

I want to change some properties of a panel located in page footer section. For doing this , I can create  an itemdata binding(or bound) event  in the pagefooter section . But this event maybe fired 12 or 13 time on a report that have only one or two page.  I found if I  could insert my code in item data binding(or bound) of the report , this event only one time is fired . My problem in the events of (except page footer section events) is "not modifying of the  element of pagetfooter section - hear 'my panel  control' " . I want to change properties of page footer section controls  by coding in the events of the report (because events of the Report only fired one time) . In the event of the "Report" I can not change the properties of the page footer section controls .