Protected Property DataSource() As Object
　Get
　　Return mDataView
　End Get

　Set(ByVal Value As Object)
　　If Value Is Nothing Then
　　Else
　　　mDataView = Value
　　　cm = CType(Me.BindingContext(mDataView), CurrencyManager)
　　　UpdateTreeView()
　　End If
　End Set
End Property

Protected Property PidMember() As String
　Get
　　Return mPidMember
　End Get
　Set(ByVal Value As String)
　　mPidMember = Value
　End Set
End Property

Protected Property DisplayMember() As String
　Get
　　Return Join(mDisplayMember, SplitChar)
　End Get
　Set(ByVal Value As String)
　　mDisplayMember = Split(Value, SplitChar)
　End Set
End Property

'注意，这几个属性都是保护成员，必须在Init事件中设置:

Public Sub Init(ByVal dispmember As String, ByVal valuemember As String, ByVal pidmember As String, ByVal cptrmember As String, ByVal datasource As DataView)
　Me.ValueMember = valuemember
　Me.DisplayMember = dispmember
　Me.PidMember = pidmember
　Me.CPtrMember = cptrmember
　Me.DataSource = datasource
　'取value最大值，新增时将value+1，保证关健值唯一。
　Me.mDataView.Sort = Me.ValueMember
　Me.m_MaxID = Me.GetValue(Me.mDataView.Count - 1)
End Sub

Protected Overridable Function GetDisplay(ByVal Index As Integer) As Object
　Dim i As Integer
　Dim temp As String = ""
　For i = 0 To mDisplayMember.Length - 1
　　temp = temp & IIf(i > 0, LinkChar, "") & mDataView(Index)(mDisplayMember(i))
　Next
　Return temp
End Function

Private Sub FillTree(ByRef pnode As myTreeNode, Optional ByVal filter As String = "")
　mDataView.RowFilter = filter
　Dim i As Integer, icol As Integer
　Dim newnode As myTreeNode
　RemoveHandler cm.PositionChanged, AddressOf cm_PositionChanged
　Me.BeginUpdate()
　For i = 0 To mDataView.Count() - 1
　　newnode = New myTreeNode(GetDisplay(i), GetValue(i), GetPid(i), GetCPtr(i))
　　'当有子结点时，为这个结点添加一个空子结点
　　If newnode.CPtr Then