private void ChartOnDoubleClick(object sender, EventArgs eventArgs) { if (_totalHistoryForm != null) { _totalHistoryForm.Focus(); } else { _totalHistoryForm = new TotalHistoryForm(_engine.PriceHistories); _totalHistoryForm.FormClosing += _totalHistoryForm_FormClosing; _totalHistoryForm.Show(); } }
void _totalHistoryForm_FormClosing(object sender, FormClosingEventArgs e) { _totalHistoryForm = null; }