WPF WindowFrame was using SystemParameters.CaptionHeight instead of SystemParameters.WindowCaptionHeight which resulted in Coordinates test failing
WPFTestRunner bug bypass with dummyWindow
Added WPF RadioButton
Copied 4 pngs from Testing/Test/ReferenceImages to Testing/WpfTestRunner/ReferenceImages because WpfTestRunner.csproj had reference to this files
Added SpinButton to WpfBackend
SpinButton added in WPFEngine
WPF RadioButton removed Mixed and AllowMixed + made posible to put Content on null in RadioButton and CheckBox(WPF)
Removed dummyWindow. Issuse should be sovled in future with Xwt.Application.ShutdownMode
Gtk CheckBox can accept Wiget content. Wpf CheckBox and RadioButton can accept null wiget.
Abit nicer code nothing special
Merge with upstream
Merge pull request #197 from DavidKarlas/master

WPF Radio and Spin buttons