private void button1_MouseHover(object sender, EventArgs e)
 {
     if (button1.Visible)
     {
         M_Consultas.BringToFront();
     }
 }
        private void pn_consultasS_Click(object sender, EventArgs e)
        {
            M_Consultas consultas = new M_Consultas();

            consultas.MdiParent = this;
            consultas.Show();
            pn_consultas.Hide();
        }
        private void M_Consultas_Click(object sender, EventArgs e)
        {
            M_Consultas consultas = new M_Consultas();

            consultas.MdiParent = this;
            consultas.Show();

            M_Consultas.Enabled = false;
        }