AnimationExtender not working correctly with button

[jimktrains]

I have an AnimationExtender set up for a panel that contains a few textboxes. I have a button in the panel (all this is enclosed in an UpdatePanel, including the panel) that when I click the button, the animation should run. It does, but just for a split second, then returns to it's original state. The animations are Scale and FadeOut. I placed a label in the panel and used it as the TargetControlID for the animation and it works as I expect. Why doesn't the button do the same? The button has no OnClick event associated with it.

And is there anywhere that has detailed instructions on the Components of the AJAX Toolkit, like Scale? I see examples but no detail of everything that can be used with it.

Thanks in advance,
Jim