private void toolStripMenuItem5_Click(object sender, EventArgs e)
{
if (formSignal == null || formSignal.IsDisposed)
{
formSignal = new FormSignalCurrentCalc();
formSignal.MdiParent = this;
formSignal.Show(dpMain, new Rectangle(50, 50, 918, 777));
}
else
{
formSignal.Activate();
}
}