B4J Question customlistview's memory is not released

Sub readWorkFile(filename As String,filesegments As List,fillUI As Boolean,root As String)
   ......
        Dim segmentsList As List
        segmentsList=sourceFileMap.Get(innerFilename)
        filesegments.AddAll(segmentsList)
        If fillUI Then
            For Each bitext As List In segmentsList
                createEmptyPane(bitext)
            Next
        End If
    Next
End Sub

Public Sub fillPane(FirstIndex As Int, LastIndex As Int)
    If segments.Size=0 Then
        Return
    End If
    Dim ExtraSize As Int
    ExtraSize=15
    For i = Max(0,FirstIndex-ExtraSize*2) To Min(Main.editorLV.Size - 1,LastIndex+ExtraSize*2)
        Dim segmentPane As Pane
        segmentPane=Main.editorLV.GetPanel(i)
        If i > FirstIndex - ExtraSize And i < LastIndex + ExtraSize Then
            'visible+
            segmentPane.Enabled=True
            If segmentPane.NumberOfNodes = 0 Then
                Dim bitext As List
                bitext=segments.Get(i)
                addTextAreaToSegmentPane(segmentPane,bitext.Get(0),bitext.Get(1))
            End If
        Else
            'not visible
            segmentPane.Enabled=False
            If segmentPane.NumberOfNodes > 0 Then
                segmentPane.RemoveAllNodes '<--- remove the layout
            End If
        End If
    Next
End Sub