private void ConnectMenuItem_OnClick(object sender, RoutedEventArgs e)
        {
            var dlg = new ConnectDialogBox(_databaseAccessService)
            {
                Owner = this
            };

            dlg.ShowDialog();
            if (dlg.DialogResult.HasValue && dlg.DialogResult.Value)
            {
                ViewModel.StatusBar.ServerName = dlg.ViewModel.ServerName;
                ViewModel.ServerStruct.Clear();
                ViewModel.ServerStruct.Add(new ServerStructViewModel()
                {
                    ServerName = dlg.ViewModel.ServerName
                });
                var tree = _databaseAccessService.GetDatabaseTree();
                tree.ServerName = ViewModel.ServerStruct[0].ServerName;
                ViewModel.ServerStruct.Clear();
                ViewModel.ServerStruct.Add(tree);
                Frame = new Frame();
                Grid.Children.Clear();
                Grid.Children.Add(Frame);
                isConnected = true;
            }
        }