[amibroker] Help! How to move buy/sell arrows from indicator plot to price plot

[rs5353]

I am struggling with this for two days.
Following AFL plots the indicator in a new pane below the price chart. But it 
also shows the up/down arrows on this indicator plot.
What do I have to do to make the arrows appear on the price chart?
The 'Show Trading Arrows' option has no effect - the arrows appear on the 
indicator plot whether it is set to 'Yes' or 'No' in the parameters box. 
Could not find any answer in the user guide. Any help would be truly 
appreciated. Thanks.


//// General - purpose Inverse Fisher Transform function

_SECTION_BEGIN("IFT");

SetBarsRequired( 200, 0 );

function InvFisherTfm( array )
{
  e2y = exp( 2 * array );
  return ( e2y - 1 )/( e2y + 1 );
}

Value1 = 0.1 * ( RSI( 5 ) - 50 );
Value2 = WMA( Value1, 9 );
IFT = InvFisherTfm( Value2 );

Plot( IFT, "IFT-RSI", colorRed, styleThick );
PlotGrid( 0.5 );
PlotGrid(-0.5 );

_SECTION_END();

_SECTION_BEGIN("SYSTEM");

Buy = Cross(IFT,Ref(IFT,-1));
Sell = Cross(Ref(IFT,-1),IFT);

Buy = ExRem(Buy,Sell);
Sell = ExRem(Sell,Buy);

PlotShapes(shapeUpArrow*Buy,colorGreen);
PlotShapes(shapeDownArrow*Sell,colorRed);

_SECTION_END();