private void nuevaVentaToolStripMenuItem_Click(object sender, EventArgs e)
{
if (ventas == null)
{
ventas = new frmVerVentas();
ventas.MdiParent = this.MdiParent;
ventas.FormClosed += new FormClosedEventHandler(VentasFormClosed);
ventas.Show();
}
}
private void VentasFormClosed(object sender, EventArgs e)
{
ventas = null;
}