private void funcionáriosToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var frmMaterial = new FrmMaterial();

            frmMaterial.MdiParent = this;
            frmMaterial.Show();
        }
 private void funcionáriosToolStripMenuItem_Click(object sender, EventArgs e)
 {
     var frmMaterial = new FrmMaterial();
     frmMaterial.MdiParent = this;
     frmMaterial.Show();
 }