Hi Brett,
Thank you for contacting Syncfusion support.
In our DockingManager when the mouse is over the AutoHidden Tab, the AutoHidden panel will open and "AutohideAnimationStarts" Event will be raised and "AutoHideAnimationStops" will raise when mouse leave AutoHidden Tab. We can use these event to update the relevent information.
We have prepared a sample that tries to meet your requirement.
You can download the sample from the below location,
Sample:
AutohideTab119980Please let us know if you need further assistance.
Regards
Ashok kumar M.