Добавьте файлы проекта.

Dialogs/EditInstrumentWindow.xaml.cs

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+using System.Windows;
+using CRAWLER.Services;
+using CRAWLER.ViewModels;
+
+namespace CRAWLER.Dialogs;
+
+public partial class EditInstrumentWindow : Window
+{
+    private readonly IFilePickerService _filePickerService;
+
+    internal EditInstrumentWindow(EditInstrumentWindowViewModel viewModel, IFilePickerService filePickerService)
+    {
+        InitializeComponent();
+        ViewModel = viewModel;
+        _filePickerService = filePickerService;
+        DataContext = ViewModel;
+    }
+
+    internal EditInstrumentWindowViewModel ViewModel { get; }
+
+    private void BrowsePdfButton_Click(object sender, RoutedEventArgs e)
+    {
+        ViewModel.AddPendingFiles(_filePickerService.PickPdfFiles(true));
+    }
+
+    private void RemovePendingPdfButton_Click(object sender, RoutedEventArgs e)
+    {
+        ViewModel.RemovePendingSelected();
+    }
+
+    private void SaveButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (!ViewModel.Validate(out var errorMessage))
+        {
+            MessageBox.Show(errorMessage, "CRAWLER", MessageBoxButton.OK, MessageBoxImage.Warning);
+            return;
+        }
+
+        DialogResult = true;
+    }
+
+    private void CancelButton_Click(object sender, RoutedEventArgs e)
+    {
+        DialogResult = false;
+    }
+}