How to add a custom PL/SQL code for a button event handler

Hi All,
I am a toddler in using Oracle Portal. So please forgive me for my ignorance.
Q : How do I add a custom PL/SQL code for a button event handler?
Basically, I would like to write MY PL/SQL function and call it. I could see that we can write "CUSTOM" code as "PL/SQL button event handler" in the form design window. But the question is that it expects only a "call" to procedure. But where do I define the procedure then? If I insert the procedure from the backend, it gets flushed the next time I compile my form.
Hope I am able to explain my point.
Thanks in advance,
Abbas.

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