BindableInkCanvas.cs

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using Windows.UI.Input.Inking;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace FamilyNotes
{
    /// <summary>
    /// Provides methods that enable binding to an InkStrokeContainer
    /// on an <see cref="InkCanvas"/> control.
    /// </summary>
    public class BindableInkCanvas : InkCanvas
    {
        /// <summary>
        /// Gets or sets the <see cref="InkStrokeContainer"/> for the current ink canvas.
        /// </summary>
        public InkStrokeContainer Strokes
        {
            get { return (InkStrokeContainer)GetValue(StrokesProperty); }
            set { SetValue(StrokesProperty, value); }
        }

        public static readonly DependencyProperty StrokesProperty = DependencyProperty.RegisterAttached(
             "Strokes",
             typeof(InkStrokeContainer),
             typeof(BindableInkCanvas),
             new PropertyMetadata(null, StrokesChanged)
           );

        private static void StrokesChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var instance = d as BindableInkCanvas;
            if (instance != null)
            {
                instance.InkPresenter.StrokeContainer = instance.Strokes;
            }
        }
    }
}