public ABMPapeleria(Papeleria p, bool elimina)
        {
            InitializeComponent();
            papel = p;
            if (elimina)
            {
                Utils.habilitar(false, gbPapel);
            }
            else
            {

            }
        }
 private void ABMEmails_FormClosed(object sender, FormClosedEventArgs e)
 {
     if (cancela)
          papel = null;
 }
 private void btnCancelar_Click(object sender, EventArgs e)
 {
     papel = null;
      Dispose();
 }