Hello gdah!
jr_2005 definitely had some great advice - since your question is about LabVIEW, be sure to post future LabVIEW questions in the appropriate forum. This particular forum is for our C compiler,
LabWindows/CVI - which also has a Tab Control.
That being said,
this article on our KnowledgeBase details how to achieve a dynamic alteration of a Tab Control's label in LabVIEW. Furthermore, I put together a quick example for you that I attached to this post.
I hope this helps!
Derrick S.
Product Manager
NI DIAdemNational Instruments