private void mDI1ToolStripMenuItem_Click(object sender, EventArgs e)
{
//if (mdi1 == null)
//{
mdi1 = new MDI1();
mdi1.MdiParent = this;
mdi1.FormClosed += new FormClosedEventHandler(mdi1_FormClosed);
mdi1.Show();
//}
//else mdi1.Activate();
}
private void mdi1_FormClosed(object sender, FormClosedEventArgs e)
{
mdi1 = null;
}
