Private Sub teil_treeView_AfterSelect(ByVal sender As Object, ByVal e As _
  System.Windows.Forms.TreeViewEventArgs) Handles teil_treeView.AfterSelect
    Try
      teil_treeView.SelectedNode = Nothing
    Catch ex As Exception
      MsgBox(ex.Message)
    End Try
  End Sub
 
  Private Sub teil_treeView_BeforeSelect(ByVal sender As Object, ByVal e As _
    System.Windows.Forms.TreeViewCancelEventArgs) Handles _
    teil_treeView.BeforeSelect
    Try
      teil_treeView.SelectedNode = Nothing
      e.Cancel = True
    Catch ex As Exception
      MsgBox(ex.Message)
    End Try
  End Sub