public MainWindow()
        {
            InitializeComponent();

            HomeForm home = new HomeForm(this);

            home.Size             = this.Size;
            MainWindowCurrentForm = home;
        }
        private void tsmiHome_Click(object sender, EventArgs e)
        {
            HomeForm home = new HomeForm();

            MainWindowCurrentForm.Close();
            home.MdiParent   = this;
            home.Size        = this.Size;
            home.WindowState = FormWindowState.Maximized;
            home.Show();
            MainWindowCurrentForm = home;
        }