collapsing a collapsable panel from code behind with new tool kit

The relevant properties are now available off of the Extender object itself (i.e., no need to call GetTargetProperties() to get a TargetProperties object).

are they? I couldn't find them.... The only way I could figure out to programmatically close the panel was by using the behaviorID and doing a _doClose in javascript...I couldn't find anything to tell it to close from a post back event in the code behind. There is a collapsed property but that only talks about its initial state it doesn't really affect the control at all during post backs. Can you post code that will let me close the panel in say the onclick event of a button
Have a look at the ClientStateLifecycle.aspx page in the Manual directory of the ToolkitTests directory in the 61121 release of the Toolkit for an example of this.