[WPF] Fix focus issues with drop down buttons
[WPF] Fix focus issues with drop down buttons

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