Maybe you can can find something interesting here:  
http://opengeo.github.com/gxp/lib/plugins/LayerTree.html

I know, it isn't the classical GeoExt library, but it should work with it.  
I didn't try it, but it seems to answer your needs!

Geoffrey


On Thu, 30 Jun 2011 04:24:41 +0200, Adam Ratcliffe <a...@prema.co.nz>  
wrote:

> Sorry Phil, haven't had any experience with that plugin in particular.
>
> Cheers
> Adam
>
> On 30/06/2011, at 2:16 PM, Phil Scadden wrote:
>
>> The messages in question are
>> http://www.geoext.org/pipermail/users/2011-March/002140.html
>>
>> and the code of concern is:
>>
>> this.plugins.push(new GeoExt.tree.ContextMenuPlugin({
>>           sliderOptions:{
>>                 aggressive: true,
>>                 plugins: new GeoExt.LayerOpacitySliderTip()
>>                }
>>           })
>>      );
>>
>>
>>
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