Sub BuildThiessen()
  Dim pMxDoc As IMxDocument
  Dim pMap As IMap
  Dim pFeatureLayer As IFeatureLayer
  Dim pInFeatureClass As IFeatureClass
  Dim pOutFeatureClass As IFeatureClass
  
  Set pMxDoc = ThisDocument
  Set pMap = pMxDoc.FocusMap
  Set pFeatureLayer = pMxDoc.SelectedLayer
  Set pInFeatureClass = pFeatureLayer.FeatureClass
  '=======================================================================
  Dim ET As New ETGW_Core
  Dim sOutFileName As String
  Dim bUseBufferedConvexHull As Boolean
  Dim dBufDist As Double
  Dim bTransferAttributes As Boolean
  bUseBufferedConvexHull = True
  dBufDist = 0.1
  bTransferAttributes = False
  sOutFileName = "c:\00\thiessen.shp"
  Set pOutFeatureClass = ET.BuildThiessen(pInFeatureClass, sOutFileName, _
                                          bUseBufferedConvexHull, dBufDist, _
                                          bTransferAttributes)
  '========================================================================
  Set pFeatureLayer = New FeatureLayer
  Set pFeatureLayer.FeatureClass = pOutFeatureClass
  pFeatureLayer.Name = pOutFeatureClass.AliasName
  pMap.AddLayer pFeatureLayer
End Sub