[Serna] Table border rendering in Serna

I'm trying to get some Serna document templates up and running but for some reason my table borders aren't
being rendered int he WYSYWIG mode.  The FO dump has the correct table-cell-border="solid thin black"
attributes and a generated PDF is rendered as expected.  Is there some trick to getting Table borders to
render within the Serna WYSIWYG view?

-Kit