private void listBugToolStripMenuItem_Click(object sender, EventArgs e) { if (alb == null) { alb = new aboutListbug(); alb.MdiParent = this; alb.FormClosed += alb_FormClosed; alb.Show(); } else { alb.Activate(); } }
void alb_FormClosed(object sender, FormClosedEventArgs e) { alb = null; //throw new NotImplementedException(); }