Commented Unassigned: UpdatePanelAnimationExtender onUpdating never fired [27993]

Hi,

I'm trying to use UpdatePanelAnimationExtender for a FadeIn/FadeOut effect but OnUpdating event is not fired.
I have to use Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler) in order to get it working.

Could you please tell me what am I doing wrong?

sample project:
https://dl.dropboxusercontent.com/u/5073388/Test.zip

Thank you,
Josep
Comments: There can be situations when someone needs to trigger a specific UpdatePanel in case of multiple UpdatePanels on a page. This situation is explained in detail in the [15788](https://ajaxcontroltoolkit.codeplex.com/workitem/15788) workitem. On the other hand, this change led to certain confusion when old code which relies on the old extender behavior is updated: [27996](https://ajaxcontroltoolkit.codeplex.com/workitem/27996) So, to keep both scenarios running, I changed the source code so that it does not break any old projects while providing an option to set up desired behavior for multiple UpdatePanel instances. If you have any comments on this, feel free to share your ideas.