[WPF] Fix widget visibility setting
[WPF] Fix widget visibility setting

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