Form personalization to select all checkboxes

Hello together,

is it possible to select all checkboxes with a special menu forms personalization?

In this case we need to select all checkboxes in the "Reconciled Transaction" Window

I created the special menu "Select All".

I created Trigger event for my created special menu "Select all" and created Action - Builtin Type FORMS_DLL. But this does not work. Can someone help me here?

='begin

go_block('RECONCILED');

First_record;

LOOP

:RECONCILED.MULTI_SELECT := 'Y';

EXIT WHEN :SYSTEM.LAST_RECORD=’TRUE’;

NEXT_RECORD;

END LOOP;

FIRST_RECORD;

end;'

Kind Regards Steffen