Hi Richard,
Thanks for using Syncfusion Products.
Sorry for the delay in getting back to you.
We are not able to understand your update because you have updated as change the Tab's label at run time.
Could you please revert us which tab you have mentioned whether it is Ribbon Tab, TabcontrolExt and so on.If you provide this information it will better for us to provide the sample regarding your query.
Regards,
Muthalagu