Fix bug in registering handler in Demo.
Fix bug in registering handler in Demo.

gertsonderby/Squire,xiamidaxia/Squire,yuhange/Squire,StileEducation/Squire,InteractiveIntelligence/Squire,yuhange/Squire,lzhengms/Squire,natejenkins/squire,StileEducation/Squire,gertsonderby/Squire,ProtonMail/Squire,xiamidaxia/Squire,InteractiveIntelligence/Squire,nsartor/Squire,xfra35/Squire,natejenkins/squire,lzhengms/Squire,neilj/Squire,Endika/Squire,nsartor/Squire,ProtonMail/Squire,neilj/Squire,Endika/Squire,xfra35/Squire