Reordering tabs does not send event

Steps to reproduce:

1. Create tabview
2. Reorder tabs
3. Try to register to event to be notified

Actual results: No event available to register to

Expected results: There is an event to be notified of reordering tabs

Reproducible with versions: 6000.2, 6000.1

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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