How to get parent window in extjs or window.opener equivalent in extjs?

How to get parent window in extjs or window.opener equivalent in extjs?

I am launching a window using HtmlPage.Window.Navigate(Uri, "_blank"); from silver light. I want to notify silverlight app from extjs unload event.

I am trying with window.opener from my extjs code in app.js

Ext.EventManager.on(window, 'beforeunload', function () {             //window.opener is undefined here             } 

Is there any extjs equivalent for window.opener? Or How to get the parent window from extjs? I am trying with the sample http://www.codeproject.com/Articles/293515/Calling-Silverlight-Method-from-Javascript-and-Jav for calling silverlight method from javascript?

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