[mapguide-users] How to get selection with fusion??

[lzzgeo]

   I am using MGOS 2.1 with fusion, I just want to get the information about
selction through the map. 
   there are some source code in the following.



    Fusion.registerForEvent(Fusion.Event.FUSION_INITIALIZED,
fusionInitialized);
    Fusion.registerForEvent(Fusion.Event.FUSION_ERROR, fusionError);
    Fusion.initialize();


var themap;
var fusionInitialized = function() {
    $('AppContainer').resize({forceResize: true});
	
	 themap = Fusion.getWidgetById('Map');
	 themap.registerForEvent(Fusion.Event.MAP_SELECTION_ON, selectionOn);
}


var selectionOn = function()
{
	 themap.getSelection(displaySelection);
}

function displaySelection(res){
	var nums =res.getNumLayers();
	alert(nums);
}

but, I get the message "getNumLayers() is not defined". why??
Is there something wrong?

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