component nsIWebBrowserPrint

[murray bryant]

I am ( for the first time) trying to use a xpcom interface from my page 
 and have been trying to call the print preview components to view a page.

From xul planet i have learnt that i am required to  connect to a 
service and then call it's instance. However in the XPCOM refence the 
instance that i want to use nsIWebBrowserPrint does not list a URI and 
so i am unsure of how to connect to it.

I have tried the following ( with various combinations) and i am aware 
that the problem is with the @mozilla.org/embedding/browser/nsWebBrowser;1

as this is the wrong component.

netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  var abrowser = 
Components.classes["@mozilla.org/embedding/browser/nsWebBrowser;1"].createInstance(Components.interfaces.nsIWebBrowserPrint);
  if (abrowser instanceof Components.interfaces.nsIWebBrowserPrint){

    printWindow = document.getElementByID("print-panel");
    abrowser.printPreview(null,printWindow);
  }

Can someone please help me with the correct reference for the component 
or where i can find a complete list of all of the components

thanks

Murray