[Users] Opacity Slider in layer tree as context menu

[Peter.Jehle at tba.llv.li]

Hi all

I know that there has been a discussion about opacity slider in the layer tree. 
I found a thread with a code example for the layertreebuilder ux of Alexandre Dube and an contextmenu plugin.
But know, this example seems to work with a treepanel constructor.
Since i use the  LayerContainer constructor of geoext and not a treepanel constructor, I have no idea about how to bind the plugin to the code
Here's the code , I use:
  
   var overlay = new GeoExt.tree.LayerContainer({
      text : 'themes',
      leaf : false,
      expanded : true,

//      contextmenu: [ new GeoExt.tree.ContextMenuPlugin({ 
// 	                  sliderOptions: {aggressive: true}
// 	        })],   

      loader : {
         filter : function(record) {
            var  isOK = false;
            if ( ! record.get("layer").isBaseLayer &&  (record.get("layer").name.indexOf("suchen") == - 1) ) {
               isOK = true;
            }
             return isOK;
         }
      }
   }
   );


Is there any simple example on how to use the layer opacity slider in the layer tree?
There's also on ticket #209 in geoext. Is this component already in the pipeline?

Regard's and thanks for any help

Peter