private void restaToolStripMenuItem_Click(object sender, EventArgs e)
{
FrmOperaciones frmOp = new FrmOperaciones(); //Utilisar Modifaller
frmOp.MdiParent = this;
frmOp.btnSuma.Enabled = false;
frmOp.Show();
}
private void sumaToolStripMenuItem_Click(object sender, EventArgs e)
{
FrmOperaciones frmOp = new FrmOperaciones();
frmOp.MdiParent = this;
frmOp.btnResta.Enabled = false;
frmOp.Show();
}