Edited Unassigned: PagingBulletedListExtender resets page [28029]

Hi,

I have a BulletedList with LinkButton as DisplayType and a PagingBulletedListExtender inside a UpdatePanel.
I recently updated AjaxControlToolkit to the version 15.1, before that it was version 3.

However, after updating the control now resets the page when I click on a link.

For example I click on the page for letter "C" and after that I click on a name.
With version 3 the bulleted list would still contain all names starting with "C".
With version 15.1 it resets the page to first letter ("A" or some number).

The only thing I changed is the AjaxControlToolkit. Can someone verify this behavior and say
wether it's a bug or a feature?

Thank in advance and kind regards
Chris