Dojo select widget validation

I am usin开发者_运维技巧g the Dojo select widget, and by default, I am displaying an empty option to user.

I am setting required attribute to true, 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.

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?

---

You can find an example of how required is used in the dojo tests (http://archive.dojotoolkit.org/nightly/dojotoolkit/dijit/tests/form/test_Select.html). If you define the "empty" option without any value that option will be invalid if required = true, like this:

<option>&nbsp;</option>

If you define the options programmatically you define the "empty" option like this:

{label: " "}