I tried to use ma_angle indicator for my ea as

1.) double MA_Angle = iCustom(_Symbol,_Period,IndicatorName,MAPeriod,ATRPeriod,ATRFactor,BarsToLoad,0,1);
2.) double MA_Angle = iCustom(_Symbol,_Period,"ma_angle",0,1);

I tried ex a condition like if MA_Angle<-50 { Do something}

but i don't see the indicator to work