public: DependencyProperty
SelectedColorProperty = DependencyProperty.Register( "SelectedColor", typeof(Color), typeof(
ColorBox),
new FrameworkPropertyMetadata( Colors.Black, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.AffectsRender | FrameworkPropertyMetadataOptions.AffectsMeasure, OnSelectedColorProperty));