public void Execute(IProgressMonitor progressMonitor)
        {
            if (Files == null || Files.Count == 0)
            {
                throw new Exception("No files to add");
            }

            using (progressMonitor.BeginTask(Resources.AddingFiles, 100))
            {
                using (var subProgressMonitor = progressMonitor.CreateSubProgressMonitor(10))
                {
                    projectController.AddFiles(subProgressMonitor, Files);
                }

                using (var subProgressMonitor = progressMonitor.CreateSubProgressMonitor(90))
                {
                    var loadPackageCommand = commandFactory.CreateLoadPackageCommand();
                    loadPackageCommand.Execute(subProgressMonitor);
                }
            }
        }