Fixed memory leak issues: 1. Unsubscription from CleanupElement.Unloaded event 2. Unsubscription from tooltipTimer.Tick event 3. Removing source hook
Fixed memory leak issues:
1. Unsubscription from CleanupElement.Unloaded event
2. Unsubscription from tooltipTimer.Tick event
3. Removing source hook

illfang/CefSharp,VioletLife/CefSharp,jamespearce2006/CefSharp,AJDev77/CefSharp,zhangjingpu/CefSharp,dga711/CefSharp,Haraguroicha/CefSharp,Livit/CefSharp,rlmcneary2/CefSharp,wangzheng888520/CefSharp,Haraguroicha/CefSharp,Livit/CefSharp,NumbersInternational/CefSharp,jamespearce2006/CefSharp,wangzheng888520/CefSharp,haozhouxu/CefSharp,rlmcneary2/CefSharp,windygu/CefSharp,Haraguroicha/CefSharp,ruisebastiao/CefSharp,gregmartinhtc/CefSharp,NumbersInternational/CefSharp,wangzheng888520/CefSharp,Haraguroicha/CefSharp,illfang/CefSharp,yoder/CefSharp,battewr/CefSharp,joshvera/CefSharp,Livit/CefSharp,twxstar/CefSharp,twxstar/CefSharp,AJDev77/CefSharp,windygu/CefSharp,rlmcneary2/CefSharp,ruisebastiao/CefSharp,ITGlobal/CefSharp,jamespearce2006/CefSharp,NumbersInternational/CefSharp,dga711/CefSharp,ITGlobal/CefSharp,yoder/CefSharp,joshvera/CefSharp,dga711/CefSharp,windygu/CefSharp,VioletLife/CefSharp,rlmcneary2/CefSharp,gregmartinhtc/CefSharp,VioletLife/CefSharp,twxstar/CefSharp,VioletLife/CefSharp,yoder/CefSharp,joshvera/CefSharp,haozhouxu/CefSharp,windygu/CefSharp,NumbersInternational/CefSharp,twxstar/CefSharp,zhangjingpu/CefSharp,ITGlobal/CefSharp,illfang/CefSharp,AJDev77/CefSharp,illfang/CefSharp,yoder/CefSharp,jamespearce2006/CefSharp,zhangjingpu/CefSharp,battewr/CefSharp,haozhouxu/CefSharp,gregmartinhtc/CefSharp,haozhouxu/CefSharp,AJDev77/CefSharp,joshvera/CefSharp,dga711/CefSharp,battewr/CefSharp,ITGlobal/CefSharp,Livit/CefSharp,zhangjingpu/CefSharp,wangzheng888520/CefSharp,jamespearce2006/CefSharp,gregmartinhtc/CefSharp,ruisebastiao/CefSharp,battewr/CefSharp,ruisebastiao/CefSharp,Haraguroicha/CefSharp