[amibroker] layer number for PlotShapes

[eskimovsin...@ymail.com]

Hi,

I have the following code to plot UP/DOWN arrows for BUY/SELL. My question is 
how do I assign a layer number so that the arrows only show up when layer 
number 2 is selected?

I created a layer called "2" and it does not work.

Buy=Cross(MACD(), Signal());
Sell=Cross(Signal(), MACD());
shape = Buy * shapeUpArrow + Sell * shapeDownArrow;
Plot( Close, "Price", colorBlack, styleCandle );
PlotShapes( shape, IIf( Buy, colorGreen, colorRed ), 2, IIf( Buy, Low, High ) );