[TIMOB-16912] ActiveTab validation is already done on Java Side
[TIMOB-16912] Correctly set selectedTab in postOpen
[TIMOB-16912] activeTab now works as a property again
[TIMOB-16912] Fix activeTab getter and creation property
Merge pull request #5674 from vishalduggal/timob-16912

[TIMOB-16912][TIMOB-8222] TabGroup fixes