I am having an issue when I have a Balloon Popup Extender tied to a label that is within a Panel using the Collapsable Panel Extender. Whenever the panel is collapsed and a post back occurs I receive an "Invalid Argument" JS error. When debugging it looks like its blowing up on the setContentSize method in the balloon popup extender JS.
This is only an issue in IE7/IE8. It works fine in IE9 (unless running in compatability mode then the issue returns).
This is only an issue in IE7/IE8. It works fine in IE9 (unless running in compatability mode then the issue returns).