dojo.connect(mygrid, "onSelected", this, function () {
       this.lookupTaskId();
   });
lookupTaskId : function() {
 var URL = "someURL";
   var xhrArgs = {
           url: URL,
           handleAs: "json",
           preventCache: true,
                       load: function (response) { console.debug(response)}
   };
   dojo.xhrGet(xhrArgs);