uploadprogress_get_info returns null in while using my custom theme

Hi,

I have installed filefield module and also enabled progress bar. While using the progress in the drupal theme(Garland), it works perfect. But when I render the same filefield cck element in my custom them and try to upload files, the progress bar is not showing up. I have analyzed and found that uploadprogress_get_info return's null while using the custom theme. Please let me know, what could be the reason for this issue.

Note : All the required(related to filefield) js, css are loaded in my custom theme.

Regards,
Sathishkumar V