当按钮位于更新面板内时，如何从内容页面调用母版页方法？

I have a masterpage and a content page. In the content page I have a script manager and an update panel. In the update panel I want to be able to click a button which would hit a public method on the master page to show a message. This works if I don't have an update panel on the content page but is there a way to get it to work when the button is in an update panel?I have a masterpage and a content page. In the