This is an interesting problem since the you need to send the GUI to the Xhost that exists out side of the chroot environment. I'm actually trying to figure out how to do this myself (run firefox from a chroot environment).
The problem you are probably having (I say probably since you didn't indicate what you have done, or any errors you got) is setting the chroot environment up incorrectly. Essentially what you need to do, is run an Xaccess server in the chroot, and then connect to it though the host system. The actual display will be processed on the host system, but the underlying process will be run in chroot.
hope this was at least a little bit of help.
regards,
...drkstr
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