This is how you can do it programatically
//RELATIVE PERFORMANCE
//list = CategoryGetSymbols(categoryMarket,3); //retreive symbols form a category
list = "EURUSD,EURGBP,EURJPY,EURCHF,EURAUD,EURCAD"; // type in symbols
fvb = Status("firstvisiblebar");
myAverage = 0;
num = 0;
for( i = 0; ( symbol = StrExtract( list, i ) ) != ""; i++ )
{
fc = Foreign( symbol, "C" );
if( ! IsNull( fc[ 0 ] ) )
{
relPerf = 100 * ( fc - fc[ fvb ] )/ fc[ fvb ];
myAverage = myAverage + relPerf;
Plot( relPerf, symbol, colorLightOrange + ( (2*i) % 15 ), styleLine );
num++;
}
}
myIndex = myAverage/num;
//Plot( myIndex,"" ,colorRed, styleThick ); // plots the average