private void ChangeRootFolder()
        {
            PFFolderBrowserDialog diag = new PFFolderBrowserDialog();
            DialogResult          res  = diag.ShowFolderBrowserDialog();

            diag.InitialFolderPath   = _rootFolder;
            diag.ShowNewFolderButton = false;

            if (res == System.Windows.Forms.DialogResult.OK)
            {
                _rootFolder = diag.SelectedFolderPath;
                _browser    = null;
                InitTreeView();
            }
        }
 private void InitTreeView()
 {
     _browser = new PFTreeViewFolderBrowser(this.treeviewFolders, _rootFolder);
 }