void OnGUI()
        {
            // Do autoresizing of GUI layer
            GUIResizer.AutoResize();

            GUI.Label(new Rect(10, 15, 430, 30), "Click on the globe to add a circle marker.", labelStyle);

            GUI.Button(new Rect(10, 45, 100, 30), "Circle radius", labelStyle);
            kmRadius = GUI.HorizontalSlider(new Rect(120, 50, 80, 20), kmRadius, 50, 1000, sliderStyle, sliderThumbStyle);

            GUI.Button(new Rect(10, 75, 100, 30), "Ring Width Start", labelStyle);
            ringWidthStart = GUI.HorizontalSlider(new Rect(120, 80, 80, 20), ringWidthStart, 0, 1f, sliderStyle, sliderThumbStyle);

            GUI.Button(new Rect(10, 105, 100, 30), "Ring Width End", labelStyle);
            ringWidthEnd = GUI.HorizontalSlider(new Rect(120, 110, 80, 20), ringWidthEnd, 0, 1f, sliderStyle, sliderThumbStyle);

            if (GUI.Button(new Rect(10, 135, 100, 30), "Clear Markers"))
            {
                map.ClearMarkers();
            }
        }