[amibroker] TickerList in comma delimited form, from Watchlist ??

[gmorlosky]

I have this code, but I need to change it so that it has a selectable Watchlist 
as a Param which that will create the comma delimited TickerList string from. 
My "for" loops just aren't building the comma delimted list right. Any help ?

_N( TickerList = ParamStr("Tickers", "^GSPC,MSFT,GE") );

This is the rest of the code:

NumBars = 20;
fvb = Status("firstvisiblebar");
Plot( 100 * ( C - C[ fvb ] ) / C[ fvb ], Name(), colorRed, styleThick | 
styleDots);
for( i = 0; ( symbol = StrExtract( TickerList, i ) ) != ""; i++ )
{
 fc = Foreign( symbol, "C" );

 if( ! IsNull( fc[ 0 ] ) )
 {
   Plot( 100 * ( fc - fc[ fvb ] )/ fc[ fvb ], symbol, colorLightOrange + ( 
(2*i) % 15 ), styleLine );
 }
}
PlotGrid( 0, colorYellow );
_N( Title = "{{NAME}} - Relative Performance [%]: {{VALUES}}" );