I can seem to find a way to select certain columns using the CustomTableDataGrid. I've tried using the ColumnsSelector property, but any value other than empty returns an error:

<cms:CMSCustomTableDataGrid ID="cmsPodcasts" 
            CustomTable="customtable.podcasts" 
            ShowHeader="true"
            EnableSorting="true"
            AllowSorting="true"
            UseUpdatePanel="true" 
            ZeroRowsText="Sorry, there were no podcasts found."
            ColumnsSelector="" 
            runat="server" />

Also, is there a way to set how the Header Row is formatted? Why isn't it using the th element? I know I can customize the web part, but I'd like to avoid doing that if possible and use what's already implemented.

Thanks!

-Eric