[OpenLayers-Users] Measure a Vector layer?

[eflow]

Hi,

I can't seem to figure out how to measure a vector layer.

My layer looks like this:

var vectorLayer = new OpenLayers.Layer.Vector("Line Vectors", {
			styleMap : sm,
			eventListeners : {
				"featuresadded" : dataLoaded
			},			
		});
var polygon = new OpenLayers.Control.DrawFeature(vectorLayer, 
						OpenLayers.Handler.Polygon, {
							displayClass : 'polyButton',
							title : 'Add Polygon',
							handlerOptions : {
								style : sty
							}
						});
editPanel.addControls([	polygon ]);

the example here: openlayers.org/dev/examples/measure.html

goes straight to this: 
new OpenLayers.Control.Measure(
                    OpenLayers.Handler.Path, {
                        persist: true,
                        handlerOptions: {
                            layerOptions: {styleMap: styleMap}
                        }
                    } 

How do I get this to work when I defined my polygon vector layer as a
OpenLayers.Control.DrawFeature? Any help would be appreciated.  Thanks!
Jonathan

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