[amibroker] How to mark a price entered in parameter window

["planctum" <planctum@xxxxxxxxx>]

Hello friends!

I need a help: I want to put only a triangle in a chart in the price 
entered in the parametric window. Like this:

CompraPer = Param("Preço de Compra", 0, 1, 1000, 0.01); 
PcCompra = IsTrue( CompraPer );
PlotShapes( shapeSmallUpTriangle*PcCompra, colorBlue, 0, L, -10 ); 

Where is my error?

Tks,
João



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