Running C#/XAML [Beta 4] in VS 2013 produces these errors (I know these are not implemented yet, but are they going to be in Beta 5, 6, RC1, etc?): Error 1 C#/XAML for HTML5: XamlPreprocessor (pass 1) failed: Type not found: "LinearGradientBrush" in namespace: "http://schemas.microsof...