[OpenLayers-Users] How to group layers in the LayerSwitcher?

[Astrid Müller]

Hello,
I am new to OpenLayers and I try to add some kind of tree into the LayerSwitcher. I found an example of grouped layers:
http://dev.openlayers.org/sandbox/jachym/openlayers/examples/layer-groups.html
I tried to do the same, but it doesn't work. In this example a layer is given to a group with the property group: "".
var layer = new OpenLayers.Layer.WMS( "",
                "http://www.....",
                {layers: "...",
                 transparent: "true", format: "image/png"},
                 {group: ".../...."
                  });

I also have a problem to find a list of possible options I can use. In the Mapping Library (http://dev.openlayers.org/docs/files/OpenLayers-js.html)
it is spoken of options, but I didn't find out which options are possible at all.
 
Thanks for any help,
Astrid





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