>  					<button label="Back"
>  oncommand="document.getElementById('surface').goBack()" />
>  					</tabpanel>
...
>  
>  A click on the button returns the following message to my 
>  error console:
>  
>  WARNING:xpcom:Python DOM script error
>  Traceback (most recent call last):
>    File 
>  "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  on\nsdom\context.py",
>  line 478, in CallEventHandler
>      return handler(*args)
>    File "chrome://main/content/main.xul", line 1, in oncommand
>    File 
>  "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  on\nsdom\context.py",
>  line 144, in __getattr__
>      return Component.__getattr__(self, attr)
>    File 
>  "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  on\xpcom\client\__init__.py",
>  line 384, in __getattr__
>      raise AttributeError, "XPCOM component '%s' has no attribute '%s'"
>  % (self._object_name_, attr)
>  <type 'exceptions.AttributeError'>: XPCOM component 
>  '<unknown>' has no attribute 'goBack'

The problem is that the result of getElementById('surface') is not what you
expect.  You need to work out which interface implements the goBack()
method, and then work out if surface is supposed to implement it (in which
case you may need an explicit QueryInterface), or if it really is some other
object implementing it (such as the window or similar).  I'm afraid that I'm
not familiar enough with these specific objects to know without looking
though...

Mark

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