Asp.net ajax+ Jquery: EndRequestHandler(sender, args)

Question

Hi,

I am working on asp.net, addon with JQuery.

After registering endRequest inside ready() function of Jquery.

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

For the function:

function EndRequestHandler(sender, args) {}

How could I retrieve the ID of the button where I click based on 'sender' and 'args'?

Thanks in advance.