BetterExplorer.MainWindow.miClearUndoList_Click C# (CSharp) Метод

    private void miClearUndoList_Click(object sender, RoutedEventArgs e) {
      tcMain.ReopenableTabs.Clear();
      btnUndoClose.IsDropDownOpen = false;
      btnUndoClose.IsEnabled = false;

	  foreach (var item in 
			  from Item in this.tcMain.Items.OfType<Wpf.Controls.TabItem>()
			  from m in Item.mnu.Items.OfType<MenuItem>()
			  where m.Tag?.ToString() == "UCTI"
			  select m) 
	  {
		item.IsEnabled = false;
	  }		
    }