全体表示コマンドの全体範囲を指定する方法

Sub setFullExtent()
    Dim pMxDocument As IMxDocument
    Set pMxDocument = ThisDocument
     
    Dim pMap As IMap
    Set pMap = pMxDocument.FocusMap
     
    Dim pActiveView As IActiveView
    Set pActiveView = pMap
     
    Dim pFeatureLayer As IFeatureLayer
    Set pFeatureLayer = pMap.Layer(0)
     
    Dim pFeatureClass As IFeatureClass
    Set pFeatureClass = pFeatureLayer.FeatureClass
     
    Dim pFeature As IFeature
    Set pFeature = pFeatureClass.GetFeature(1)
     
    Dim pEnvelope As IEnvelope
    Set pEnvelope = pFeature.Shape.Envelope
     
    '全体表示コマンドの全体範囲
    pMap.AreaOfInterest = Nothing   'すべてのレイヤのデータ範囲（デフォルト）
    pMap.AreaOfInterest = pEnvelope 'その他（表示範囲の指定はEnvelopeで設定）
 
    '現在の全体表示範囲を取得
    Dim pFullExtent As IEnvelope
    Set pFullExtent = pActiveView.FullExtent
 
End Sub