Using the right event/method for the PDF Factsheet.

When we click on the button to display the PDF Factsheet the current setup forces a java script to be used, named OpenPopup(). This seems to execute and complete before the DO_HANDLE_EVENT method is called. So if I place a break-point in the do_handle_event the PDF is on the screen before the breakpoint is displayed.

I want to detect the button value BEFORE the PDF Factsheet is created and was wondering if anyone knew how this can be achieved. I'm using B P_HEAD/OVERVIEW.

Jason