UpdatePanelAnimationExtender - OnUpdating always executed

As per
http://www.asp.net/AJAX/Control-Toolkit/Live/UpdatePanelAnimation/UpdatePanelAnimation.aspx

It is important to note that because of the UpdatePanel architecture, the OnUpdating animation will always play when any partial postback starts, but the OnUpdated animation will only play at the end of a partial postback if its UpdatePanel was changed (note: setting the UpdatePanel's UpdateMode="Always" will ensure the OnUpdated animation plays when every partial postback completes)

So we can't have UpdatePanelAnimationExtender for individual UpdatePanel in a page..