Clear google map drawing manager tool

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Javascript

Google-Maps

Hi everyone,

How can i clear drawing manager and allow user to draw one polygon at once

My code goes here

$(".PolygonAdd").click(function (e) {
             var drawingManager = new google.maps.drawing.DrawingManager({
                 drawingMode: google.maps.drawing.OverlayType.POLYGON,
                 drawingControl: false,
                 drawingControlOptions: {
                     position: google.maps.ControlPosition.TOP_RIGHT,
                     drawingModes: [google.maps.drawing.OverlayType.POLYGON]
                 },
                 polygonOptions: {
                     id: "New Polygon",
                     fillColor: #1EA448,
                     fillOpacity: 0.3,
                     strokeColor: #1EA448,
                     strokeOpacity: 0.6,
                     strokeWeight: 4,
                     clickable: true,
                     zIndex: 1,
                     editable: true
                 }
             });

             drawingManager.setMap(map);
             google.maps.event.addListener(drawingManager, 'overlaycomplete', function (e) {
                 if (e.type != google.maps.drawing.OverlayType.MARKER) {
                     drawingManager.setDrawingMode(null);
                     //drawingManager.setOptions({
                     //    drawingControl: false
                     //});
                 }
                 NewPolygon = e.overlay;
                 NewPolygon.type = e.type;
                 Polygons[0] = NewPolygon;
                 google.maps.event.addListener(NewPolygon, 'click', function () {
                     setSelection(this);
                 });

                 drawingManager.setDrawingMode(null);
             });
         });&lt;/pre&gt;</pre>

If i click "PolygonAdd" multiple times, I can able to draw polygon multiple times with the tool but this should not happen.

I should able to reset drawing manager. How Can i do this??? Please help me with this

Thanks in advance....