public void Execute(object parameter)
        {
            _canExecute = false;

                    var flvm = (FolderListVM)parameter;
                    var fs = new FileServiceClient();
                    var dialog = new SaveFileDialog();
                    string ext =Path.GetExtension(flvm.SelectedFile);
                    dialog.Filter = "*" + ext + "|*" + ext;

                    //   dialog.DefaultFileName = flvm.SelectedFile;
                    bool? filesel = dialog.ShowDialog();
                    fs.GetFileCompleted += (sender, args) =>
                    {
                        if (filesel.Value == true)
                        {
                            using (var stream = dialog.OpenFile())
                            {
                                var b = args.Result;
                                stream.Write(b, 0, b.Length);
                                stream.Close();
                            }

                        }
                    };
                    fs.GetFileAsync(Path.Combine(flvm.ClientRepository, flvm.SelectedFolder) + "\\" + flvm.SelectedFile);

            _canExecute = true;
        }