I think I've got a fix for the EmptyDataTemplate issue:

Add the following to RenderContents in GridViewAdapter.cs right before the ///// BODY //// section

/////////////// EmptyDataTemplate ///////////////////////
if (gridView.Rows.Count == 0) {
	//Control[0].Control[0] s/b the EmptyDataTemplate.
	if (gridView.HasControls()) {
		if (gridView.Controls[0].HasControls()) {
			if (gridView.Controls[0].Controls[0] is GridViewRow) {
				rows.Clear();
				rows.Add(gridView.Controls[0].Controls[0]);
				gvrc = new GridViewRowCollection(rows);
				WriteRows(writer, gridView, gvrc, "tfoot");
			}
		}
	}
}

Add the following to GetRowClass right before return className.Trim();

//// EmptyDataTemplate 
if ((row.RowType & DataControlRowType.EmptyDataRow) == DataControlRowType.EmptyDataRow) {
	className += " AspNet-GridView-Empty ";
}

Finally, if you want to override the standard tfoot style, add a CSS section in GridViewExample -

/* Optional AspNet-GridView-Empty to override tfoot used for EmptyDataTemplate */
.AspNet-GridView table tfoot tr.AspNet-GridView-Empty td 
{
	color: #F7F6F3;
	background: #5D7B9D;
	font-weight: bold;
	border-bottom: solid 1px #CCCCCC;
	border-right: solid 1px #CCCCCC;
	padding: 2px;
}

I've only worked with the GridView so far, hopefully someone can adapt this where necessary.

-Chris