Help: Subform does not hide in Acrobat

maybe typical newbie problem, but...

i try create expandable section in pdf form using designer 7.
dynamic section number of text , interactive form fields
placed within subform named "mysubform". idea have checkbox
"mycheckbox" controls visibility of dynamic section.

i tried following code in mycheckbox::change script (javascript,
client-side):

if (this.rawvalue == 1)
mysubform.presence = "visible";
else
mysubform.presence = "hidden";

what experience when preview pdf form in designer or when
open pdf acrobat 7, subform *always* displayed regardless of
the checkbox value. when query subform's presence attribute, see
that is correctly set "hidden" above script, acrobat 7
seems ignore "hidden" setting.

what doing wrong?

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