Would help if a create a example to show the behavior that I have now?
I found a way!
I can use the event of the component ("onclick="SimpleTogglePanelManager.toggleOnClient(event,$$('div.uniqueClassName').id);"/>" , putting uniqueClassName styleClass of rich:simpleTogglePanel ). This is might not the best thing, I thought the opened attribute should work, but in another hand we don't have less process with server (in case of switchType="client").
I thanks the guys on seam forum: http://www.seamframework.org/Community/HowToCollapseASimpleTogglePanel#comment100396
PS: How can I close this topic?