title: FBJS/FBML: Display a textbox on click of radio button
body: <p>I want to use FBML as a canvas and would like to display a textbox on click of radio button.
  Can anybody out there help me out on this? e.g. if a user selects other as option it should make appear a text box. Is it possible? how? I'm eager to learn more from the responder.</p>