CrystalReportViewer issue when using AJAX CalenderExtender control

[Guest]

Hi,

I'm not sure if this is bug or not.
I have a asp.net page which use AJAX CalenderExtender control for user to
select a date. There is also a CrystalReportViewer control on this page,
which is used to display some information after user selects a date and click
on Submit button. When I clicked the Submit button, the report displayed for
a few seconds only, then it disappeared. If I remove AJAX control from this
page, the report shows on forever(properly).
Any idea?

Thanks in advance.

William