UniqueValueRenderer を使用したユニークな値の取得

'ArcGIS 10.1 SP1を入れるとIDataStatistics::UniqueValueでメモリリーク エラーとなる。その場合の回避方法。
Sub test()
  Dim pMxDoc As IMxDocument, pFLayer As IFeatureLayer
  Dim pCursor As ICursor
  Set pMxDoc = ThisDocument
  Set pFLayer = pMxDoc.FocusMap.Layer(0)
  
  Set pCursor = pFLayer.Search(Nothing, False)
  
  Dim pUniqueValueRenderer As IUniqueValueRenderer
  Set pUniqueValueRenderer = New UniqueValueRenderer
  
  pUniqueValueRenderer.FieldCount = 1
  pUniqueValueRenderer.Field(0) = "P_NUM"
    
  Dim pRow As IRow
  Set pRow = pCursor.NextRow
  
  Do Until pRow Is Nothing
    pUniqueValueRenderer.AddValue pRow.value(9), "", Nothing
    Set pRow = pCursor.NextRow
  
  Loop
  
  Debug.Print pUniqueValueRenderer.ValueCount
  
  Dim i As Long
  For i = 0 To pUniqueValueRenderer.ValueCount - 1
  
    Debug.Print pUniqueValueRenderer.value(i)
  
  Next i

End Sub