Hiding a caption and field based on context condition

Hi,
I have what should be a simple problem, but I'm not sure if what I'm doing is the correct way to solve it.
I have a telephone number of a user master being output, and if there is an extension number I want to output that as well, separated by ext
In the context node I have put a condition on the Extension field (GS_HEADER-FSABE-TEL_EXTENS1 not equals INITIAL), and debugging the code of the function module shows that %OUTPUT is not being called for the Extension field in the layout as expected.
The Extension field in the layout is bound to the Extension field in the context, and the caption is set as "Ext"
Therefore I either want to output
Telephone: 01234 567890 ext 1234
or
Telephone: 01234 567890
It's not working though, as I still get ext printing even when there is no Extension - have I done something wrong or is this not the correct way to go about this?
Thanks,
Vindaloo

Thanks very much, this has solved the problem
In the layout:ready event for the extension field I have put the following Javascript:
// Hide the Telephone Extension caption & value if it is not populated
if (this.rawValue == null) {
this.presence = "hidden";
I was under the misapprehension that simply putting a condition onto the field in the context would stop it being passed to the form and rendered.
The layout:ready event seems to be the best place to put this code. However, the adobe help for this event is confusing as it contains the following:
Initiates after the form design and data are merged, the form exists, and the form's layout is applied. At this time, the finished form has not been rendered; therefore, a calculation or script set to run on this event could modify the layout before the form is rendered.
This is fine and fits in with what I have. It then goes on to say:
Note: Scripts that fire on layout:ready should not do anything that would cause the layout of the form to change. For example, this would include anything involving subforms or tables that grow or shrink, adding fragments dynamically at run time, adding or removing subform instances, and toggling the presence setting of an object between hidden and visible.
This seems to be in direct conflict with the previous statement, regarding modifying the layout.
Vindaloo

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Edited by: Joice John on Jul 17, 2009 4:30 AM
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