[mapguide-users] selectionXML Problem

[Greg]

I am having trouble getting the current selection by using GetSelectionXML(),
passing the selection XML to the server and getting the selection.  When a
new item is selected for about 90% of the features, I get the correct Item. 
For the other 10%, the item is not found, even though the correct properties
are shown in the properties pane.  I am using the basic layout.  Below is my
code that takes the XML and gets the item from the Mapguide server.  Any
ideas what might be happening?

<%
    String sessionId = Request.Form.Get("SID");
    String selectionXML = Server.UrlDecode(Request.Form.Get("sel"));
    //Response.Write("sessionId: " + sessionId + "<br>selectionXML:  " +
selectionXML);

    string realPath = Request.ServerVariables["APPL_PHYSICAL_PATH"];
    String configPath = realPath + "webconfig.ini";
    MapGuideApi.MgInitializeWebTier(configPath);

    MgUserInformation userInfo = new MgUserInformation(sessionId);
    MgSiteConnection siteConnection = new MgSiteConnection();
    siteConnection.Open(userInfo);
    if (siteConnection == null)
    {
        Response.Write("Failed to get site connection.");
        return;
    }

    MgResourceService resService =
(MgResourceService)siteConnection.CreateService(MgServiceType.ResourceService);
    MgFeatureService featureService =
(MgFeatureService)siteConnection.CreateService(MgServiceType.FeatureService);

    MgMap map = new MgMap();
    map.Open(resService, "Cid_Map");

    //get LineID information for selected feature (line)
    MgSelection selection = new MgSelection(map, selectionXML);
    MgLayer layer = (MgLayer)map.GetLayers().GetItem("lines_ss_cid");
    string strLayerClassName = layer.GetFeatureClassName();
    string strSelection = selection.GenerateFilter(layer,
strLayerClassName);
    MgFeatureQueryOptions nameQuery = new MgFeatureQueryOptions();
    nameQuery.SetFilter(strSelection);
    MgResourceIdentifier resID = new
MgResourceIdentifier("Library://data/sdf/lines_ss_cid.FeatureSource");
    MgFeatureReader featureReader = featureService.SelectFeatures(resID,
"lines_ss_cid", nameQuery);
    string strLineID = "";
    if(featureReader.ReadNext())
        {
            strLineID = featureReader.GetInt32("LineID").ToString();
        }
    else
        {
            //this shouldn't happen
            Response.Write("LineID not found in Mapguide datasource.");
        }
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