There appears to be another issue with this now. If you try to add a tab dynamically the text doesn't show up when added.
After the tabstrib has been reloaded on a postback after the tab is added it then shows up properly.
Right now my work around is instead of adding the tab directly, I add it into the DB record that contains the tab configuration (to maintain tabs across sessions) and then reload the entire tab strip everytime a new tab is added by the user. It isn't pretty, but I have it working for now. But it would be nice if the Text property of the RadTab is properly applied when using a tab template with dynamic generation.
Thanks,
Doug
Edit: I did discover that calling
RadTabStrip1.DataBind() after the tab is added seems to refresh the tabstrip enough to show the properly configured tab.