Steps to Reproduce

use Breeze theme

run the attached example
1) add tabs until the tabs become scrollable
2) close all tabs using the button
3) add more tabs

Current Result

the tabs added in step 3 are breaking the layout (until they become scrollable again)

Expected Result

tabs should be added horizontally

Debug Info

Root Cause

Workaround

call

tabbox.invalidate() 

after closing all tabs (commented out in the attachment)