AvalonDock.TestApp.MainWindow.dockManager_DocumentClosing C# (CSharp) Метод

        private void dockManager_DocumentClosing(object sender, DocumentClosingEventArgs e)
        {
            if (MessageBox.Show("Are you sure you want to close the document?", "AvalonDock Sample", MessageBoxButton.YesNo) == MessageBoxResult.No)
                e.Cancel = true;
        }