[WPF] Properly implement WindowFrame.Close
[WPF] Properly implement WindowFrame.Close

mono/xwt,cra0zy/xwt,TheBrainTech/xwt,lytico/xwt,directhex/xwt,iainx/xwt,residuum/xwt,sevoku/xwt,antmicro/xwt,mminns/xwt,mminns/xwt,hwthomas/xwt,hamekoz/xwt,akrisiun/xwt,steffenWi/xwt