I finally got the onTimer() to execute. Had to change my button onclick() code to this:
add(new ProgressUpdateBehavior(executor)); ajax.addComponent(this); It began working when I added the second line above. Without that, the client didn't receive the updated component with the new timer script. ** This email and any attachments may contain information that is confidential and/or privileged for the sole use of the intended recipient. Any use, review, disclosure, copying, distribution or reliance by others, and any forwarding of this email or its contents, without the express permission of the sender is strictly prohibited by law. If you are not the intended recipient, please contact the sender immediately, delete the e-mail and destroy all copies. **