title: Dojo select widget validation
body: <p>I am using the Dojo select widget, and by default, I am displaying an empty option to user. </p>
  
  <p>I am setting required attribute to <code>true</code>, but Dojo validation is not making / changing background color for the selection when form is submitted,but still it is applying CSS style for other validation text boxes. </p>
  
  <p>I tried to apply my own custom style, but Dojo is overridding those. Is it possible to do required validation on select widget and get coloring?</p>