The error happens when using default d3:Chart control:

System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.SolidColorBrush' and 'System.Windows.Media.Brush'. Consider using Converter property of Binding. BindingExpression:Path=Stroke; DataItem='AxisGrid' (Name=''); target element is 'Path' (Name=''); target property is 'Stroke' (type 'Brush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.SolidColorBrush' and 'System.Windows.Media.Brush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='Axis' (Name=''); target element is 'Path' (Name=''); target property is 'Stroke' (type 'Brush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.SolidColorBrush' and 'System.Windows.Media.Brush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='Axis' (Name=''); target element is 'Path' (Name=''); target property is 'Stroke' (type 'Brush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.Brush' and 'System.Windows.Media.SolidColorBrush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='PlotAxis' (Name='PART_horizontalAxis'); target element is 'Axis' (Name=''); target property is 'Foreground' (type 'SolidColorBrush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.SolidColorBrush' and 'System.Windows.Media.Brush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='Axis' (Name=''); target element is 'Path' (Name=''); target property is 'Stroke' (type 'Brush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.SolidColorBrush' and 'System.Windows.Media.Brush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='Axis' (Name=''); target element is 'Path' (Name=''); target property is 'Stroke' (type 'Brush')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Media.Brush' and 'System.Windows.Media.SolidColorBrush'. Consider using Converter property of Binding. BindingExpression:Path=Foreground; DataItem='PlotAxis' (Name='PART_verticalAxis'); target element is 'Axis' (Name=''); target property is 'Foreground' (type 'SolidColorBrush')

Fixed by changing Axis.Foreground and AxisGrid.Stroke from "SolidColorBrush" to "Brush", so that these properties can be successfully bound to other "Foreground(type 'Brush')" properties.