[WPF] Implement tab changed event
[WPF] Implement tab changed event

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