public void Execute(object parameter)
            {
                string path = null;

                if (parameter != null && !File.Exists(parameter.ToString()))
                {
                    MessageBox.Show("Unable to find the path, please select new path!", "Warning", MessageBoxButton.OK, MessageBoxImage.Warning);
                    parameter = null;
                }
                if (parameter == null)
                {
                    OpenFileDialog ofd = new OpenFileDialog();
                    ofd.Title  = "打开项目";
                    ofd.Filter = "gse项目文件|*.gse";
                    if (ofd.ShowDialog().GetValueOrDefault())
                    {
                        path = ofd.FileName;
                    }
                }
                else
                {
                    path = parameter.ToString();
                }

                if (!string.IsNullOrEmpty(path))
                {
                    TreeItem.Solution = Solution.Deserialize(path);


                    New @new = null;
                    if (Application.Current.MainWindow != null && Application.Current.MainWindow.GetType().Name.Equals("New"))
                    {
                        @new = (New)Application.Current.MainWindow;
                    }
                    Application.Current.MainWindow = new MainWindow();
                    Application.Current.MainWindow.Show();
                    if (@new != null)
                    {
                        @new.Close();
                    }
                }
            }