/// <summary>
        /// Displays the scene GUI handles.
        /// </summary>
        protected override void DisplaySceneGUIHandles()
        {
            base.DisplaySceneGUIHandles();
            AnimationCurve newSpeedCurve = null;

            if (
                SceneGUI.BeginHandles(this.Target, "Change Movement Speed Curve") &&
                s_HandleTogglePreference.CurrentValue
                )
            {
                Vector3 up = this.Target.transform.InverseTransformDirection(Vector3.up);
                newSpeedCurve = FalloffHandles.DiscGraph(
                    target.GetHashCode(),
                    this.Target.SpeedCurve,
                    Vector3.zero,
                    Quaternion.LookRotation(Vector3.forward - Vector3.Dot(Vector3.forward, up) * up, up),
                    s_HandleColorPreference.CurrentValue,
                    "Run Speed", "Walk Speed", "Distance", "Speed"
                    );
            }
            if (SceneGUI.EndHandles())
            {
                this.Target.SpeedCurve = newSpeedCurve;
            }
        }