private void AddFileToDatabase(DatabaseReference database)
        {
            var dialog = new OpenFileDialog()
            {
                Filter      = "All files|*.*",
                Multiselect = false
            };

            if (dialog.ShowDialog() != true)
            {
                return;
            }

            try
            {
                if (InputBoxWindow.ShowDialog("New file id:", "Enter new file id", Path.GetFileName(dialog.FileName), out string id) == true)
                {
                    var file = database.AddFile(id, dialog.FileName);
                    SelectedCollection = database.Collections.First(a => a.Name == "_files");
                    ListCollectionData.SelectedItem = file;
                    ListCollectionData.ScrollIntoView(ListCollectionData.SelectedItem);
                }
            }
            catch (Exception exc)
            {
                MessageBox.Show(
                    "Failed to upload file:" + Environment.NewLine + exc.Message,
                    "Database error",
                    MessageBoxButton.OK,
                    MessageBoxImage.Error
                    );
            }
        }