[amibroker] multiple color bars in histogram

["rajesh69_astro" <rajesh69_astro@xxxxxxxxx>]

i was using following to give three colors to histogram bars. but it
is nt functioning can anyone pl correct.

b1= IIf(Ref(A1[i], -1)<=A1[i],colorGreen,colorRed); 
              
b2= IIf((SlowMA - FastMA) <= Ref(SlowMA - FastMA,
-1),colorGreen,colorRed);
tg=((b1= colorGreen) AND (b2=colorGreen));
tr =((b1== colorRed) AND (b2==colorRed));

barcolor= IIf(tg,colorGreen, IIf(tr,colorRed, colorDarkGrey));

Graph0BarColor=barcolor

this is nt giving green red and grey bar is it because of nested iif 
kindly advice 

thanks









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