I have a masterpage with a Ext:ScriptManager. In my content form, I have a Ext:ScriptManagerProxy. The content form also contains a regular html button. I tried adding a CustomAjaxEvent to ScriptManagerProxy with target set to the button, but the server side event never fires. When I view the source of the page, I can't find any reference to 'Coolite.Ext.Callback' in the javascript rendered.