private void productosToolStripMenuItem_Click(object sender, EventArgs e) { if (listaprod == null) { listaprod = new frmListaProductos(); listaprod.MdiParent = this; listaprod.FormClosed += new FormClosedEventHandler(ListaProd_FormClosed); listaprod.Show(); } }
void ListaProd_FormClosed(object sender, EventArgs e) { listaprod = null; }