private void pOPToolStripMenuItem_Click(object sender, EventArgs e)
{
if (popFrm == null)
{
popFrm = new PopForm();
popFrm.WindowState = FormWindowState.Maximized;
popFrm.MdiParent = this;
popFrm.Show();
}
else
{
foreach (Form frm in Application.OpenForms)
{
if (frm is PopForm)
{
frm.Activate();
}
}
}
}