参考

http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=44083&skin=0

http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=83890&skin=0

mouseMove事件

\'static ptime As Date = Nothing
\'Dim sp As TimeSpan = Date.now - ptime
\'ptime = Date.now
\'If sp.TotalMilliseconds < 50  Then \'间隔1000毫秒
    \'Return
\'End If
static pnd As object
Dim tree As windows.Forms.treeview = e.sender.basecontrol
Dim x As Integer = System.Windows.Forms.Cursor.Current.Position.X
Dim y As Integer = System.Windows.Forms.Cursor.Current.Position.Y
Dim pt = tree.PointToClient(new Point(X, Y))  \'取当前坐标
Dim nd As System.Windows.Forms.TreeNode = tree.GetNodeAt(pt) \'取坐标所在位置的节点
If nd Is Nothing OrElse pnd Is Nothing OrElse pnd.name <> nd.name Then
    For i As Integer = tree.Controls.Count - 1 To 0 Step -1
        If tree.Controls(i).Name = "SelectLab" Then
            tree.Controls.RemoveAt(i)
        End If
    Next
    If nd IsNot Nothing
        Dim selCon As  System.Windows.Forms.Control = tree.Controls("SelectLab")
        Dim label As New System.Windows.Forms.Label
        label.Name = "SelectLab"
        label.AutoSize = False
        label.BackColor = Color.Red
        label.ForeColor = nd.ForeColor
        label.Font = new font(tree.Font.name, tree.Font.size, FontStyle.Bold )
        tree.Controls.Add(label)
        selCon = Label
        Dim node As System.Windows.Forms.TreeNode = nd
        selCon.Size = new Size(node.Bounds.Width+5, node.Bounds.Height)
        selCon.Location = new Point(node.Bounds.X, node.Bounds.Y)
        selCon.Text = nd.Text
    End If
End If
pnd = nd

你nodemouseclick事件的代码，写到afterSelectNode事件去，然后

全局代码

Public Sub lbl_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
    sender.parent.selectedNode = sender.tag
End Sub

mousemove事件

\'static ptime As Date = Nothing
\'Dim sp As TimeSpan = Date.now - ptime
\'ptime = Date.now
\'If sp.TotalMilliseconds < 50  Then \'间隔1000毫秒
\'Return
\'End If
static pnd As object
Dim tree As windows.Forms.treeview = e.sender.basecontrol
Dim x As Integer = System.Windows.Forms.Cursor.Current.Position.X
Dim y As Integer = System.Windows.Forms.Cursor.Current.Position.Y
Dim pt = tree.PointToClient(new Point(X, Y))  \'取当前坐标
Dim nd As System.Windows.Forms.TreeNode = tree.GetNodeAt(pt) \'取坐标所在位置的节点
If nd Is Nothing OrElse pnd Is Nothing OrElse pnd.name <> nd.name Then
    For i As Integer = tree.Controls.Count - 1 To 0 Step -1
        If tree.Controls(i).Name = "SelectLab" Then
            tree.Controls.RemoveAt(i)
        End If
    Next
    If nd IsNot Nothing
        Dim selCon As  System.Windows.Forms.Control = tree.Controls("SelectLab")
        Dim label As New System.Windows.Forms.Label
        label.Name = "SelectLab"
        label.AutoSize = False
        label.BackColor = Color.Red
        label.ForeColor = nd.ForeColor
        label.Font = new font(tree.Font.name, tree.Font.size, FontStyle.Bold )
        tree.Controls.Add(label)
        selCon = Label
        Dim node As System.Windows.Forms.TreeNode = nd
        selCon.Size = new Size(node.Bounds.Width+5, node.Bounds.Height)
        selCon.Location = new Point(node.Bounds.X, node.Bounds.Y)
        selCon.Text = nd.Text
        selCon.tag = nd
        AddHandler selCon.Click, AddressOf lbl_Click
    End If
End If
pnd = nd