http://blogs.msdn.com/b/jebarson/archive/2011/10/13/application-bar-button-menu-item-not-firing-binding-in-windows-phone.aspxOn a Windows Phone application and if you are using a two way binding along with Application Bar Button or Menu, you might be having a nightmare that the binding for the last focused control is not happening when you click the application bar button oren-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)