[amibroker] How to retrieve the position of a vertical study line?

["archstone2003" <archstone2003@xxxxxxxxx>]

Hi,

I want to draw a vertical line and then in AFL code find out on which 
bar this vertical line was drawn.

I tried a little bit and the way I found out is:
IsNull() returns 1 on bars before the vertical line, returns empty on 
the vertical line, and returns -1 after the line. But I am afraid that 
this is not documented behavior.

Is there a better way to do it?

Thanks.

Wei



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