Also,
you can take a look at this
thread form post 50 and son on.
As with MQL4 you have :
#property indicator_level1
#property indicator_level2
#property indicator_level2
etc
#property indicator_color1
#property indicator_color2
#property indicator_color3
etc
You don't have
#property indicator_levelcolor1 an so on
There is only one chance to set the indicator color.