I don't know if this will work, but try to define a 'group' literal in
the options when defining the WMS layer and then filter on that when
defining the container:
var wmslayer = new OpenLayers.Layer.WMS(
"layername", "/geoserver/gwc/service/wms",
{ layers: 'what:ever', transparent: true, format: "image/gif" },
{ isBaseLayer: false, visibility: true, group: "groupName" }
);
and in the loader for the container:
loader: {
filter: function (record) { // this filters on the literal 'group:'
on each layer
return record.get("layer").options.group === "groupName";
}
}
Good Luck
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