private void Tree_Drop(object sender, DragEventArgs e)
        {
            if (!e.Data.GetDataPresent(DataFormats.FileDrop, true))
            {
                return;
            }

            var files = e.Data.GetData(DataFormats.FileDrop, true) as string[];

            if (files == null || files.Length == 0)
            {
                return;
            }

            foreach (var filePath in files)
            {
                AppService.AddProjectAssembly(filePath);
            }

            e.Handled = true;
        }