Derek,
That is covered in the documentation. It is called hyperlinkaliastext.
<subselection color="0xfbfe0a" linewidth="4" alpha="0.8" />
Jonathan,
I do not have anything in place to symbolizing the related features, the symbology that you see is what is returned by the server and then a Glow is added to it when you choose a particular related feature in the datagrid. The glow color is controlled by this line in the eSearchWidget.xml<subselection color="0xfbfe0a" linewidth="4" alpha="0.8" />