[amibroker] why this simple code doesn't work as I expect?

[groups <groups@xxxxxxxxxxxx>]

hello everyone,

this simple code depends on selected day visibility. if the day of the 
selected bar "fits" in visible area everything is OK (see 1.png). if it 
doesn't the formula doesn't work either (see 2.png, use plus/minus 
magnifying glass icons for time scaling)

how can I fix that code so that it doesn't depend on visibility?

SelectedDay = SelectedValue(DateNum());
arr = DateNum() == SelectedDay;
Plot(arr,"",colorRed,styleHistogram);

thanks in advance for clarification,
BM


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