Dynamic Change the Captioned Text

Hi Guru,

Original Captioned is "1234"

But Business Requirement is to change them dynamically depend on program passed parameter.

If ($.parent.TESTRUN.isNull) then

    $.parent.TESTRUN.caption = "AAAA"

else

    $.parent.TESTRUN.caption = "BBBB"

endif

Such Logic already applied to

initialize; doReady;ready:Form;ready"layout

But the result is Always "1234".

Any Idea what is missing?

Regards,

Matthew