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; }