Silverlight 5 app from iframe not closing in IE9

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Javascript

IFrame

IE9

, +

I am developing a web application using Dojo v1.8 and my target machine runs IE9 and Silverlight 5.1.20125. In this web app, the user can select a tool from a toolbar at the top of the page that will open up in a content pane (or an IFrame if it is an external tool) below the toolbar (only one tool can run at a time).

The bug I am encountering is that one of the external tools that opens in an IFrame runs a Silverlight app, and if the user tries to select another tool, the new tool won't open and the Silverlight application stays there. After checking the DOM Tree, all references to the Silverlight application have been wiped, and the new tool is there instead (which is the desired behavior).

So my question is, why is the Silverlight Application still being viewed even when it is gone from the DOM Tree, and is there a way to programmatically close it from Javascript? Also, I do NOT have access to the source code of the Silverlight Application.

The code for clearing out the div (_targetNode) which holds the current tool is as follows:

while(_targetNode.hasChildNodes()) {
     var widgetInstance = dijit.byId(_targetNode.lastChild.id);

     // If this is undefined, then the tool is not a dijit widget
     if (typeof widgetInstance == "undefined") {
          // My first attempt to resolve the issue.  It had no effect.
          if(_targetNode.lastChild.tagName.toUpperCase() == "IFRAME") {
               _targetNode.lastChild.contentWindow.close();
          }
          _targetNode.removeChild(_targetNode.lastChild);
     } else {
          // This is a dijit widget, so call it's destroy function
          widgetInstance.destroy();
     }
}