Change Colour of ROC indicator

[tradingindependiente]

Hello i use this indicator and i need change the colour of the bar if is greather o than "0"

Indicator:
ROC(EMA(Stock(Daily),n period),n period)

How i do to change the colours:
- if this indicator is greather than > 0 = green (bar)
- if this indicator is less than < 0 = red (bar)

[NinjaTrader_AdamP]

trading,

Here is an example :

                        if (ROC(EMA(Stock(Daily),period),period) [0] > 0)
			{
				PlotColors[0][0] = Color.Blue;
			}		
			else
			{
				PlotColors[0][0] = Color.Red;
			}

Please let me know if I may assist further.