private void button3_MouseHover(object sender, EventArgs e)
 {
     if (button3.Visible)
     {
         M_Analises.BringToFront();
     }
 }
        private void pn_analisesS_Click(object sender, EventArgs e)
        {
            M_Analises analises = new M_Analises();

            analises.MdiParent = this;
            analises.Show();
            pn_analises.Hide();
        }
        private void M_Analises_Click(object sender, EventArgs e)
        {
            M_Analises analises = new M_Analises();

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

            M_Analises.Enabled = false;
        }