QGroupBox title styles won't work on Mac

QGroupBox title styles won't work on Mac

References

Reference NO 1

http://stackoverflow.com/questions/15197588/qgroupbox-title-styles-wont-work-on-mac

Reference NO 2

http://stackoverflow.com/questions/14582591/border-of-qgroupbox

Reference NO 3

http://stackoverflow.com/questions/14049290/make-qgroupboxtitle-expand

Reference NO 4

http://stackoverflow.com/questions/16241131/styling-a-qtabwidget-to-add-a-bottom-border-only-on-the-tab-widget-does-not-wo

Reference NO 5

http://stackoverflow.com/questions/10394347/style-not-working-with-qitemdelegate

Reference NO 6

https://bugreports.qt-project.org/secure/ReleaseNote.jspa?projectId=10510&version=11533

Reference NO 7

#EANF#

Reference NO 8

#EANF#