Wpf: Fix setting a Window's BackgroundColor
Wpf: Fix setting a Window's BackgroundColor

bbqchickenrobot/Eto-1,l8s/Eto,bbqchickenrobot/Eto-1,PowerOfCode/Eto,l8s/Eto,l8s/Eto,PowerOfCode/Eto,bbqchickenrobot/Eto-1,PowerOfCode/Eto