When using the PopupControl extender, if you run into an issue where the popup control does not pop up in the correct position when the page is scrolled you should make sure you have these HTML elements on your page:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
Last Modified:
4/8/2007 3:29:13 PM