DatePicker component fails on the client side under IE

After upgrading to 5.3.5, the date picker widget used by DateField component broke in IE8:
After opening the widget, it won't dismiss when user clicking any dates/buttons on it.

From the look of the JavaScript error, the error is thrown from prototype.js. And if I downgrade Tapestry 5.3.4, the problem is gone.

I notice a change in T5.3.5, which suggest that the new Prototype library doesn't work with date picker anymore:
TAP5-1989 - Upgrade bundled Prototype to version 1.7.1