ListGrid link field NOT visisble - white

Hi
I'm using SmartClient Power edition version 9.
I have a ListGrid with an email column. I did the following to enable the email as a link on the column:

{
name: email,
title: Email,
type: "link",
linkURLPrefix: "mailto:",
width: 220,
showHover: true
},

This works well, BUT - the link text is WHITE!!
How can I change this - I've looked at documentation and is NOT sure at all. It can be blue - it must just be visible please.

Thanks