title: Custom dialog on TextField tap?
body: <p>My question is similar to <a href="https://stackoverflow.com/questions/12828398/show-datepicker-on-textfield-tap">Show datepicker on textfield tap</a> but I need to do this in Flutter.</p>
  
  <p>I have a TextField showing a date an I want to pop up a date dialog when user taps on it.</p>
  
  <p>Is there another widget I should use instead of a TextField for this?</p>