How can i remove feature selection from my layeroverlay in mapguide API?

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i can add feature to my layeroverlay on mapguide API but i don't know i can i remove it. Have you an idea ? Thanks ! :)

This is how i add features to my layer :

MgFeatureReader featureReader = layer.SelectFeatures(queryOptions);MgSelection mgSelection = new MgSelection(map);mgSelection.AddFeatures(layer, featureReader, 0);mgSelection.Save(resourceService, strMapName);map.Save();

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