I think the following post was misplaced somewhere else, so I brought it here:
http://news.infragistics.com/forums/t/10449.aspx
Summarizing... Is it possible to tell UltraTabControl that it should not draw the focus rectangle on the active tab? Maybe something along the lines of changing the ActiveTabAppearance or something. Any ideas?
The following article explains how to do this: http://devcenter.infragistics.com/Support/KnowledgeBaseArticle.Aspx?ArticleID=4791
Thank you! It worked for me too!