void OnGUI()
        {
            GUI.backgroundColor = Color.red;
            GUILayout.BeginHorizontal();
            {
                if (GUILayout.Button("Next"))
                {
                    m_tester = m_testers.CircularNext(m_tester);
                }

                if (GUILayout.Button("Previous"))
                {
                    m_tester = m_testers.CircularPrev(m_tester);
                }
            }
            GUILayout.EndHorizontal();
            GUI.backgroundColor = Color.white;

            m_tester.DrawGUI();
        }
 void Awake()
 {
     m_testers = GetComponentsInChildren <PerformanceTester>().ToList();
     m_tester  = m_testers.First();
 }