I'm new to Kendo UI. When I checked the demo of ButtonGroup, I didn't see any examples about integration with AngularJS.
Any examples or documentation are appreciated.
The ButtonGroup is part of the Hybrid suite. Which AngularJS integration is documented here: http://docs.telerik.com/kendo-ui/AngularJS/angular-hybrid. Shortly, the only integration relevant to ButtonGroup is that its instantiated trough the kendo-mobile-button-group directive.
Furthermore, all other settings and possible AngularJS-related topics are the same as the basics of the Kendo UI integration with AngularJS that is documented here: http://docs.telerik.com/kendo-ui/AngularJS/introduction.
You can examine the ButtonGroup Overview demo implemented with AngularJS in this dojo: http://dojo.telerik.com/ucAhU.
I hope that helps.