Added convenience mehtod for getting the MainFrame of the CefBrowser more easily.
Added convenience mehtod for getting the MainFrame of the CefBrowser more easily.

zhangjingpu/CefSharp,wangzheng888520/CefSharp,VioletLife/CefSharp,jamespearce2006/CefSharp,illfang/CefSharp,Livit/CefSharp,dga711/CefSharp,twxstar/CefSharp,rover886/CefSharp,windygu/CefSharp,wangzheng888520/CefSharp,illfang/CefSharp,dga711/CefSharp,AJDev77/CefSharp,Octopus-ITSM/CefSharp,joshvera/CefSharp,windygu/CefSharp,dga711/CefSharp,battewr/CefSharp,rlmcneary2/CefSharp,twxstar/CefSharp,yoder/CefSharp,rlmcneary2/CefSharp,Octopus-ITSM/CefSharp,ITGlobal/CefSharp,windygu/CefSharp,ITGlobal/CefSharp,zhangjingpu/CefSharp,yoder/CefSharp,yoder/CefSharp,ruisebastiao/CefSharp,zhangjingpu/CefSharp,Haraguroicha/CefSharp,haozhouxu/CefSharp,ITGlobal/CefSharp,gregmartinhtc/CefSharp,wangzheng888520/CefSharp,wangzheng888520/CefSharp,AJDev77/CefSharp,dga711/CefSharp,Livit/CefSharp,windygu/CefSharp,Octopus-ITSM/CefSharp,haozhouxu/CefSharp,VioletLife/CefSharp,yoder/CefSharp,haozhouxu/CefSharp,twxstar/CefSharp,NumbersInternational/CefSharp,joshvera/CefSharp,VioletLife/CefSharp,Haraguroicha/CefSharp,Octopus-ITSM/CefSharp,Haraguroicha/CefSharp,ruisebastiao/CefSharp,Livit/CefSharp,ITGlobal/CefSharp,VioletLife/CefSharp,gregmartinhtc/CefSharp,jamespearce2006/CefSharp,AJDev77/CefSharp,Livit/CefSharp,rover886/CefSharp,jamespearce2006/CefSharp,AJDev77/CefSharp,NumbersInternational/CefSharp,joshvera/CefSharp,battewr/CefSharp,gregmartinhtc/CefSharp,battewr/CefSharp,ruisebastiao/CefSharp,zhangjingpu/CefSharp,rover886/CefSharp,rlmcneary2/CefSharp,Haraguroicha/CefSharp,haozhouxu/CefSharp,rlmcneary2/CefSharp,NumbersInternational/CefSharp,illfang/CefSharp,NumbersInternational/CefSharp,ruisebastiao/CefSharp,jamespearce2006/CefSharp,twxstar/CefSharp,jamespearce2006/CefSharp,rover886/CefSharp,illfang/CefSharp,joshvera/CefSharp,battewr/CefSharp,rover886/CefSharp,Haraguroicha/CefSharp,gregmartinhtc/CefSharp