Custom Search Dialog returns no results in CRM 2015

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  We've recently upgrade from CRM 2011 to CRM 2015.  A Silverlight component (I know but we're stuck with it) has a section in it which displays a CRM search dialog.  Since the upgrade the dialog doesn't return any data?
  
  string lookupString = SilverlightUtility.GetServerBaseUrl().ToString();
  int competitorID = Convert.ToInt32((double)HtmlPage.Window.Eval("window.parent.GetObjectTypeCode('competitor')"));
  lookupString += "/_controls/lookup/lookupinfo.aspx?AllowFilterOff=1&DefaultType=" + competitorID + "&DefaultViewId=%7b3BF5B939-6D58-477C-B903-95C43F1EDA56%7d&DisableQuickFind=0&DisableViewPicker=0&LookupStyle=single&ShowNewButton=1&ShowPropButton=1&browse=0&currentid=%7b77C1B4E8-9FEB-E111-A81A-00155D1434D0%7d&objecttypes=" + competitorID;
  dynamic ReturnedParams = HtmlPage.Window.Invoke("showModalDialog", lookupString, null, "dialogWidth:800px;dialogHeight:900px");
  
  if (ReturnedParams == null)
  {
     HtmlPage.Window.Alert("ReturnedParams == null");  -- ALLWAYS GETS TO HERE
  }
  else
  {
     HtmlPage.Window.Alert("ReturnedParams IS NOT NULL");
  }
  
  Does anyone know how to fix this? 
  

  Wednesday, June 15, 2016 2:44 PM