Hi Jerry,
You can handle the cellclick and add the preview row to the current selection. Please find the sample below.
Here is a sample.
http://www.syncfusion.com/Support/user/uploads/PreViewWithSelection_ab462dd2.zip
If you want the selection to be navigated using the Arrowkeys, then you can use the technique shown in this KB:
http://www.syncfusion.com/Support/article.aspx?id=10496
Best Regards,
Haneef