[OpenLayers-Users] How to use more than one 'SelectFeature' controls

[hz20040]

Dear List!
 
I have got a problem about 'SelectFeature' control.
There are two gml layers.I want to use two 'SelectFeature' to select them.
But I found only the SelectFeature control which's gml layer is added last 
will work.
 
In the code,if I use myMap.addLayers([gmlLayer1,gmlLayer2]),the gml2Control will 
work well,but gml1Control will not work. If I use myMap.addLayers([gmlLayer2,gmlLayer1]), the gml1Control will work well,but gml2 not.
 
It looks like which gml layer is added last , the select control to it will work.
Can I use more then one 'SelectFeature' controls to more then one gml layers?
 
Thank you !
 
 
My code is:

        function init()
        {  
         myMap = new OpenLayers.Map('map3d');                
            var opt= {numZoomLevels:1}; 
            var graphic = new OpenLayers.Layer.Image(
                                'name',
                                '/Images/Maps/chunxi.jpg',
                                //new OpenLayers.Bounds(-450, -289, 450, 289),
                                new OpenLayers.Bounds(-320, -240, 320, 240),
                                new OpenLayers.Size(1600, 1200),
                                opt);                        
            
            var userstyle =  OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['userselect']);

 
            //add an image layer
            myMap.addLayers([graphic]);
 
           //one gml layer
            var gmlOption = {
                style:userstyle                
            };            
            var gmlLayer1= new OpenLayers.Layer.GML("GML1", "url",gmlOption);
          
                     
           //another gml layer
           var toolTipsOption = {
                //style:userstyle
           };
           var gmlLayer2 = new OpenLayers.Layer.GML("GML2","url",toolTipsOption);  
         
           myMap.addLayers([gmlLayer2,gmlLayer1]);
          // myMap.addLayers([gmlLayer1,gmlLayer2]);
          
 
            //one SelectFeature control:gml1Control
            gml1Control = new OpenLayers.Control.SelectFeature(gmlLayer1,
                {onSelect: onFeatureSelect,
                onUnselect:onFeatureUnselect,
                 hover:false
             });            
            myMap.addControl(gml1Control);
            gml1Control.activate();            
    
           //another SelectFeature control:gml2Control
           gml2Control = new OpenLayers.Control.SelectFeature(gmlLayer2,
                {
                    onSelect:onToolTipsFeatureSelect,
                    onUnselect:onToolTipsFeatureUnselect,
                    hover:false
                }
           );
           myMap.addControl(gml2Control );
           gml2Control.activate();    

           myMap.setCenter(new OpenLayers.LonLat(0, 0), 1);
           myMap.zoomToMaxExtent();
         
              
    }  
    
    function onToolTipsFeatureSelect(feature)
    {
        alert("onToolTipsFeatureSelect");
    }
    
    function onToolTipsFeatureUnselect(feature)
    {
        alert("onToolTipsFeatureUnselect");
    }
    
    function onFeatureSelect(feature)
    {
        alert("onFeatureSelect");
    }
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