public FormPrincipal()
 {
     InitializeComponent();
     mostrarToolStripMenuItem.Enabled = false;
     mostrar = new FormMostrar();
     test    = new FrmTestDelegados();
 }
 private void mostrarToolStripMenuItem_Click(object sender, EventArgs e)
 {
     mostrar           = new FormMostrar();
     mostrar.MdiParent = this;
     mostrar.Show();
 }