title: Message Box yesnoButtons in windows phone 7.5
body: <p>In window phone 7.5 . I  want to use yes no buttons in message box  . But there is no option for yes no buttons in message box. How can i use with yes no  buttons  or other alternate to show  caption (OK =yes and cancel =no) 
  Please help me.</p>
  
  <p>Thanks in advance.</p>