Forms9i -- Disabling buttons?

We're building an application in Forms9i. When i was working with earlier versions I often used code like:
set_item_property('ADG.BUTTON', ENABLED, PROPERTY_FALSE);
That compiled and runned fine.
So I used that as well in the new Forms9i application. However now I get the message:
FRM-41046: Invalid parameter use Set_Item_Property
When I check this in the help files it states (Enabled (item) property):
"Applies to all items except buttons, chart items, and display items"
So obviuously I can't use this to disable a button. In the help files of Forms4.5 it states the same, but it workend.
Question: How do I disable a button in Forms9i?
Thanks in advance,
Paul

Duncan,
Thanks for your reply. Must have jumped to conclusions.
I simplified the example what i actually did was:
i created a procedure
procedure set_button_enabled( p_item_id item
, p_true_false varchar2
is
begin
set_item_property( p_item_id
, ENABLED
, p_true_false
end;
and called that like:
set_button_enabled( v_button_rpo_id
, 'PROPERTY_FALSE'
I assume for now that the PROPERTY_FALSE value can't be passed like this.
Regards,
Paul

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Very courius.
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1) scenario
Simply changing .setEnabled(false) invokation, the class works fine.
so
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jButton1.setEnabled(false);
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