Vaadin Version 7.2.2 - TabSheet cannot be enabled again

General
1

With Vaadin version 7.2.2, TabSheet widgets are not able to be enabled, if the
parent widet ( HorizontalLayout ) has been disabled are enabled again.

2

I tried this and was able to reproduce the problem. I’ve filed
a ticket
 about the issue.

3

I think, a ticket for this problem was already created ( Ticket 14012 )
Anyway, thanks for your efforts !