改变焦点节点的方法

Dim tree As System.Windows.Forms.TreeView = Forms("xxx").Controls("TreeView1").BaseControl

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

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 = e.Node.ForeColor
label.Font = tree.Font
mytree.BaseControl.Controls.Add(label)
selCon = Label
Dim node As System.Windows.Forms.TreeNode = tree.SelectedNode
selCon.Size = new Size(node.Bounds.Width, node.Bounds.Height)
selCon.Location = new Point(node.Bounds.X, node.Bounds.Y)     这里是什么意思？
selCon.Text = e.Node.Text

这是我在帮助的论坛里找的，有点看不懂。请帮助？ "SelectLab" 事件没有定义，怎么突然来了