[amibroker] Are Trailing Stops & Stop Profit instructions giving reliable results ?

[rem_yah]

Hi,

Are Trailing Stops and Stop Profit instructions in AmiBroker giving
reliable results ?

I created a simple code ( see the AFL code below), but
when I back-test it, I obtain a lot of ApplyStop  (stopTypeTrailing &
stopTypeProfit)  false
signals, as shown on the picture  ( a false stopTypeTrailing on the left
and a false stopTypeProfit on the right)
http://img54.imageshack.us/img54/7419/e007.gif

My settings to this strategy ( I have marked ON) :
Activate stops immediately, Reverse entry signal forces exit, Allow same
bar exit.

Can somebody check it and confirm or deny my observations  ?

Regards
Rem 


PositionSize = MarginDeposit = 1;  

ApplyStop(stopTypeTrailing, stopModePoint, TickSize *
Param("stopTypeTrailing", 30, 2, 100, 1 ), 1 ); 
ApplyStop(stopTypeProfit, stopModePoint, TickSize *
Param("stopTypeProfit", 10, 2, 100, 1 ), 1 ); 



bottomLevel = Open - 10*TickSize; // = Buy level
Buy = bottomLevel >= Low ;
BuyPrice = bottomLevel ; 

topLevel = Open + 10*TickSize; // = Short level
Short = topLevel <= High ;
ShortPrice = topLevel ; 
Cover= Buy ;
Sell= Short ;

CoverPrice= IIf( bottomLevel >= Low, BuyPrice, Close); 
SellPrice= IIf(topLevel <= High, ShortPrice, Close); 

Plot(topLevel, "topLevel", colorRed);
Plot(bottomLevel, "bottomLevel", colorGreen);