Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        Dim dirs As New ArrayList
        Dim tn As TreeNode
        tn = ?????
        Me.ListBox1.Items.Clear()
        For Each f As String In tn.Checked = True
            dirs.Add(f)
        Next
        For Each f As String In dirs
            Me.ListBox1.Items.Add(f)
        Next
    End Sub