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