missing proxy for a Window

This is probably a question for Russel,

while debugging the new Javascript dom implementation i 
traced down a problem to a null pointer exception and 
then made the error message more readable like this:
Caused by: java.lang.RuntimeException: DomWindow.open failed for 'target' _proxy is null
	at com.meterware.httpunit.dom.DomWindow.open(DomWindow.java:87)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:145)
	... 55 more


The cause seems to be the constructor which does not set 
a proxy:
    /**
     * construct me from a document
     * @param document
     */
    public DomWindow( HTMLDocumentImpl document ) {
        _document = document;
    }


all other constructors do.
The constructor is called from:
    /**
     * get the Window
     * @return the window
     */
    public DomWindow getWindow() {
    	// if there is now window yet
      if (_window == null) {
      	// create a window for this document
         _window = new DomWindow( this );
        setParentScope( _window );
      }
      return _window;
    }


This is the only line where I could find a setProxy - 
which is in WebResponse.getReceivedPage
                ((HTMLDocumentImpl) _page.getRootNode()).getWindow().setProxy( this );


How should the proxy be correctly set here?

Yours
  Wolfgang

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