Bottom DataGrid Pager does not work properly

[ZhqY]

Hi,
I have a page with a datagrid whose pagerStyle-position is set to
TopAndBottom. The Pager on the top works fine, but the bottom one does
not work appropriately - when a pager button on the bottom one is
clicked, sometimes the PageIndexChanged does not fire, so the page is
not displayed well.

Please help!

Thanks,

ZhqY