private HighlightCanvasHighlight StartTrackingForHighlight(HighlightCanvasHighlight hl, MoveableBodyPart bodyPart)
{
hl.StartTracking(bodyPart).WhenMoved((center) => this.MoveHighlightToPoint(hl, center(this.CurrentCenter)));
hl.WhenActivated(this.ActivateHightlight).RelativeTo(this.GetPrimaryHighlight);
hl.WhenDeactivated(this.DeactivateHightlight);
return hl;
}