[mapguide-users] clear selection of one layer

[stoff]

I tried to manage the selection on serverside (look below) and afterwards
refreshing the map
by parent.parent.mapFrame.Refresh(); from the taskframe clientside.
Refreshing works, but the
layers I want the selection cleared are still shown

Here is my serverside asp.net(vb.net) code: 

 Protected Sub ManageSelection(ByVal selectionXML As String, ByVal siteConn
As MgSiteConnection, ByVal mapName As String)

        Dim resourceService As MgResourceService =
TryCast(siteConn.CreateService(MgServiceType.ResourceService),
MgResourceService)
        Dim featureService As MgFeatureService =
TryCast(siteConn.CreateService(MgServiceType.FeatureService),
MgFeatureService)
        Dim i As Integer
        Dim map As New MgMap()
        Dim layers As MgReadOnlyLayerCollection
        Dim selection As MgSelection = Nothing

        map.Open(resourceService, mapName)

        If (selectionXML IsNot Nothing) AndAlso (selectionXML <> "") Then
            selection = New MgSelection(map, selectionXML)
            layers = selection.GetLayers()
        Else
            layers = Nothing
        End If

        If layers IsNot Nothing Then
            Dim queryOptions As New MgFeatureQueryOptions()
            For i = 0 To layers.GetCount() - 1

                Dim layer As MgLayer = TryCast(layers.GetItem(i), MgLayer)

                If (layer IsNot Nothing) And layer.Name =
m_ExpertiseConfig.SelectableLayer Then

                    ' Create a filter containing the IDs of the selected
features on this layer
                    Dim layerClassName As String =
layer.GetFeatureClassName()
                    Dim selectionString As String =
selection.GenerateFilter(layer, layerClassName)

                    ' Get the feature resource for the selected layer

                    Dim layerFeatureId As String =
layer.GetFeatureSourceId()
                    Dim layerFeatureResource As New
MgResourceIdentifier(layerFeatureId)

                    ' Apply the filter to the feature resource for the
selected layer. This returns
                    ' an MgFeatureReader of all the selected features.

                    queryOptions.SetFilter(selectionString)
                    Dim featureReader As MgFeatureReader =
featureService.SelectFeatures(layerFeatureResource, layerClassName,
queryOptions)

                    ' get FIDs of all objects
                    m_slSelectionFIDs.Clear()

                    While featureReader.ReadNext()
                        If selectionString.Contains("FID") Then
                            Debug.Print(featureReader.GetInt64("FID"))

                            'Do something else ...

                        End If
                    End While
                Else
                    'Here is my problem: How do I clear the selection of the
layer?
                    If selection.GetLayers.Contains(layer) Then
                        selection.GetLayers.Remove(layer)
                        Dim layerFeatureId As String =
layer.GetFeatureSourceId()
                        Dim layerFeatureResource As New
MgResourceIdentifier(layerFeatureId)
                        selection.Save(resourceService, m_giUtils.MapName)
                        layer.ForceRefresh()
                    End If
                End If
            Next
        Else
            Debug.Print("No Selection")
        End If

        map.Save()


    End Sub
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