arrow_color in OrderSend - Bug?

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In the documentation, in the last parameter in the function OrderSend it sais: "Color of the opening arrow on the chart. If parameter is absent or has CLR_NONE value opening arrow is not drawn on the chart.". But if the parameter is absent the arrow IS drawn. Even if I use the value CLR_NONE explicitly it is still drawn. I would like to have my own drawing without the default interfering. Why is this behaviour not as documented?

Thanks,
Doji
 
In the testing mode arrows are drawn always.
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