You could have it like:
PHP Code:
addRow( 0, "0\tTitle\tCritical" );
and then sort it ascending and show the text list at a negative x.
This is a workaround, but it's the only way I've ever known.
Basically, have a 0 at the front, and sort it ascending. High gets 1, Medium gets 2, etc.
Wish there was a better way.