import org.openscales.core.layer.capabilities.*;
import org.openscales.core.basetypes.maps.HashMap;

var wmsCap:HashMap;
var wmsURL:String = "http://localhost:8080/geoserver/wms";
var wmsGC:GetCapabilities = new GetCapabilities("wms", wmsURL,
this.capabilitiesGetter, "1.1.0");
function capabilitiesGetter(getCap:GetCapabilities):void {
        this.wmsCap = getCap.getAllCapabilities();

        var keys:Array = wmsCap.getKeys().sort();
        for(var i:uint = 0; i < keys.length; i++){
                var layerName:String = wmsCap.getValue(keys[i]).getValue("Name");

                //I need this one to work to enable call to
GetLegendGraphic request
                var layerStyle:Object = wmsCap.getValue(keys[i]).getValue("Style");
        }

Oke i figure it out. I can actually construct the GetLegendGraphic request
from Layer's Tittle
wmsCap.getValue("sf:archsites").getValue("Title");