Dynamically change the binding of a field

Hi,

I've been looking all over the internet for 2 days to find the answer to my question, but I couldn't get any information on my problem. Here's what i'm trying to do :

Based on a checkbox in my form, I want to export or I don't want to export a field to a XML document.

My checkbox is working properly and I got the Send button with the XML working too. I only need to find a way to dynamically change the binding property of my field. I've read some informations with the ".bind.match", but I can't seem to make it work.

I'm using Windows XP, LiveCycle Designer ES2 v.9.0 and I have to run the form in Reader 8.0.

Thanks alot for your help, it's greatly appreciated.

Jonathan