Backtesting multiinstrument strategy wrong date range

[nysetrader]

I'm backtesting multiinstrument strategy on a date range(for example 01.01.2011 - 12.01.2011). If there is a symbol in a list which is traded only part of that range (since 06.01.2011) all strategy executing only on the range of this instrument(since 06.01.2011).
How can I solve this problem? Is there any way to check if instrument was traded during the whole range I need before using Add(instrument)?

[NinjaTrader_Joydeep]

Hello nysetrader,
Thanks for writing in and I am happy to assist you.

You can check time of the first bar and take proper steps

if (CurrentBar == Math.Max(0, BarsRequired))
{
	//do something
}

Please let me know if I can assist you any further.

[nysetrader]

I think I can use your code in OnBarUpdate(). And I need to use it in Initialize() before Add(). Should be smth like this:

protected override void Initialize()
{
if(EnoughData on Symbol)
{
Add(Symbol, PeriodType.Minute, 1);
}
}

How can I check it?

[NinjaTrader_Joydeep]

Hello nysetrader,
Unfortunately there is no supported way of checking the data without loading it first.

Please let me know if I can assist you any further.