code: function(evt) {
          var passes = true;
          if (this.down && this.first) {
              passes = this.down.xy.distanceTo(this.first.xy) <= this.dblclickTolerance;
          }
          return passes;
      }
docs: Method: passesDblclickTolerance
  Determine whether the event is within the optional double-cick pixel
  tolerance.
  
  Returns:
  {Boolean} The click is within the double-click pixel tolerance.