TimePicker doesn't support seconds?

I want to change the format from to include seconds.

If the timepicker receives any format it thinks is invalid, it defaults back to "hh:mm tt", hiding the error

I couldn't find any documentation on whether it support seconds at all, or what an actual valid format string looks like.

I've tried "HH:mm:ss" among a few other things but this does not work.

Demo: 

http://dojo.telerik.com/UqAFO/2