In case anyone was interested, here's how its done.
DotNetNuke.Data.
DataProvider.Instance().AddTab(PortalId, TabName, IsVisible, DisableLink,
ParentId, IconFile, Title, Description, Keywords, Url, SkinSrc, ContainerSrc, TabPath,
StartDate, EndDate, RefreshInterval, PageHeadText, IsSecure);
Thanks.
Derek