Closed Issue: OnUpdated animation starts before OnUpdating has finished [21310]

The UpdatePanelAnimationExtender control will cancel the OnUpdating animation and start the OnUpdated animation as soon as the UpdatePanel async postback returns. This is not always desirable as it can cause animations to not appear correctly. For example, on the Sample page for the control, if you remove the Thread.Sleep line in the code-behind, the 'Collapse' animation will not finish before control is returned to the browser, so the animation is cancelled and the OnUpdated starts.
The control should have an option to allow the OnUpdating animation to always finish before the OnUpdated starts.
Comments: Added this feature in the release June 2012.