ApplicationBar

<phone:PhoneApplicationPage.ApplicationBar>
  <shell:ApplicationBar IsVisible= " True ">
    <shell:ApplicationBarIconButton IconUri= " /Images/appbar_button1.png " Text= " Won't work " Click= " ApplicationBarIconButton_Click " />
  </shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>
private  void ApplicationBarIconButton_Click( object sender, EventArgs e)
  {
    MessageBox.Show( " This messagebox won't show! ");
  }