AJAX :: UpdatePanel Not Work In Accordion?

i have Accordion out side update panel ,

i want to add button as trigger of UpdatePanel where that Button inside Accordion,

i have tried this solution but its not give me any error but its dont update my udpanel, and when i have added it at design , it will give me error at runtime.

protected
void Page_Load(object sender,
EventArgs e) {
AsyncPostBackTrigger trigger =
new AsyncPostBackTrigger();
Button mybtn=Accordion1.FindControl("Mybtn") as Button;
trigger.ControlID =mybtn.ID;
trigger.EvernName="Click";
upUpdatePanel.Triggers.Add(trigger);
}