ArcGIS JSAPI: Measurement + Popup Combo

customMeasurementDijit.js

/*
 * Custom Measurement Widget extension that connects to Popup dijit (esri/dijit/Popup), 
 * retrieves the selected feature, then passes the geometry to be measured by the Measurement Dijit.
 */
define("custom.Measurement", 
  [
    "dojo/_base/declare", 
    "dojo/_base/lang", 
    "esri/dijit/Measurement", 
    "dojo/query",
    "dojo/on", 
    "dojo/dom-construct"
  ], 
  function (declare, lang, Measurement, dojoQuery, dojoOn, domConstruct) {
  return declare([Measurement], {
    postCreate: function () {
      this.inherited(arguments);
      // check if the infoWindow exists
      if (this.map && this.map.infoWindow) {
        // ad
        var node;
        try {
          node = domConstruct.create("a", {
            innerHTML: "Measure me", 
            href: "javascript:void(0);"
          }, dojoQuery(".actionList", this.map.infoWindow.domNode)[0]);
        } catch(err) {
          // probably could not get to the actionList class item.
        }
        if (node) {
          dojoOn(node, "click", lang.hitch(this, this._calculateGraphicItem));
        }
      }
    },
    // when link clicked, this gets the selected feature and measure the geometry.
    _calculateGraphicItem: function (evt) {
      var graphic = this.map.infoWindow.getSelectedFeature();
      if (graphic && graphic.geometry) {
        this.measure(graphic.geometry);
      }
    }
  });
});