The CSS class assigned to disabled tabs in the 15.1 Toolkit differs from previous releases. The "__tab_disabled" class was assigned to the tab previously (a SPAN) and now in v15.1 it gets assigned to the hyperlink. The "__tab_active" class works as it did previously getting assigned to the tab (SPAN). This would seem to me anyhow to be inconsistent behavior.
Version 7.1213 HTML:
![Image](http://1drv.ms/1FD41fy)
![Image](http://1drv.ms/1FD4cHJ)
Version 15.1 HTML:
![Image](http://1drv.ms/1FD4b6p)
![Image](http://1drv.ms/1aXJYAY)
Version 7.1213 HTML:
![Image](http://1drv.ms/1FD41fy)
![Image](http://1drv.ms/1FD4cHJ)
Version 15.1 HTML:
![Image](http://1drv.ms/1FD4b6p)
![Image](http://1drv.ms/1aXJYAY)