private void DefinirHorariosToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (validarUser == null || validarUser.IsDisposed)
                validarUser = new ValidarUsuario(this, "asignar horario");
            else
                validarUser.BringToFront();

            validarUser.Show();
        }
        private void ModificarDatosPersonalesToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (validarUser == null || validarUser.IsDisposed)
                validarUser = new ValidarUsuario(this, "datos personales");
            else
                validarUser.BringToFront();

            validarUser.Show();
        }