FF extension : goUpdateCommand not calling the command

Firefox version : 4.0.1

I have a commandset which fires when something is selected.

The commandset is working fine. If I put a simple window.alert('test'); it does fire. However when I try to call another c开发者_JAVA百科ommand using goUpdateCommand, it does not call it.

The code in the browserOverlay.xul is as below :

<command id="cmd_testselect" oncommand="window.alert('command fired');"/>

<commandset commandupdater="true"

events="select"

oncommandupdate="goUpdateCommand('cmd_testselect');"/>

Note : I have added the globalOverlay.js as below :

<script type="application/x-javascript" src="chrome://global/content/globalOverlay.js"/>

Any ideas what I might be doing wrong ?

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I think you actually meant to call goDoCommand() and not goUpdateCommand().