MACD on MTF

[Stem1]

Hi, I'm trying to code a strategy that looks at another time frame to see if the MACD Plot is above zero and is higher than the previous bar on that time frame. I've tried different variations of the following but without being able to compile;
MACD(BarsArray[1], (12, 26, 9).MACD[0] > 0
MACD(BarsArray[1], (12, 26, 9).MACD[0] > MACD(BarsArray[1], (12, 26, 9).MACD[1]
Any help is appreciated, thanks!

[NinjaTrader_Bertrand]

Stem1, did you Add your higher frame series in the Initialize() method?

http://www.ninjatrader-support.com/HelpGuideV6/MultiTimeFrameInstruments.html

Also, 6.5 this would only be possible in strategies, not indicators.

For our new public beta NT7, indicators could use multi-series approaches as well.

[Stem1]

Yes I used Add(PeriodType.Minute, 60); and this is in a strategy(not indicator).
I just found the problem, the correct versions are;
MACD(BarsArray[1], 12, 26, 9)[0] > 0
MACD(BarsArray[1], 12, 26, 9)[0] > MACD(BarsArray[1], 12, 26, 9)[1]
Thanks