Draw line onto InkCanvas

I'd like to be able to draw shapes onto an InkCanvas. So far I have the following XAML:-

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Canvas x:Name="selectionCanvas" />
    <InkCanvas x:Name="inker" />
</Grid>

In the page constructor I have the following:-

inker.InkPresenter.UnprocessedInput.PointerPressed += StartLine;
inker.InkPresenter.UnprocessedInput.PointerMoved += ContinueLine;
inker.InkPresenter.UnprocessedInput.PointerReleased += CompleteLine;
inker.InkPresenter.InputProcessingConfiguration.RightDragAction = InkInputRightDragAction.LeaveUnprocessed;

And the three events are as follows:-

private void StartLine(InkUnprocessedInput sender, PointerEventArgs args)
{
    line = new Line();
    line.X1 = args.CurrentPoint.RawPosition.X;
    line.Y1 = args.CurrentPoint.RawPosition.Y;
    line.X2 = args.CurrentPoint.RawPosition.X;
    line.Y2 = args.CurrentPoint.RawPosition.Y;

    line.Stroke = new SolidColorBrush(Colors.Purple);
    line.StrokeThickness = 4;
    selectionCanvas.Children.Add(line);
}

private void ContinueLine(InkUnprocessedInput sender, PointerEventArgs args)
{
    line.X2 = args.CurrentPoint.RawPosition.X;
    line.Y2 = args.CurrentPoint.RawPosition.Y;

}

private void CompleteLine(InkUnprocessedInput sender, PointerEventArgs args)
{

}

Is there anyway I can draw the line currently drawn on the selectionCanvas onto my InkCanvas?

Thanks,

Geoff