private void ReloadTreeView_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         FolderView.Items.Clear();
         TreeViewLeft.StartCreateTree(FolderView);
     }
     catch (Exception ex) { MessageBox.Show(ex.Message); }
 }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            try
            {
                TreeViewLeft.mw = this;
                TreeViewLeft.StartCreateTree(FolderView);
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }

            Thread thread = new Thread(pd);
            //thread.Start();
        }