Hmmm...my inclination is to say that the null displaying in the tooltip for 
the LineChart is actually a bug.  Null's shouldn't be displayed at all (and 
many features of the API depend on this being true).  Perhaps the solution 
is to implement an option to include nulls in tooltips, but make it false 
by default.

On Thursday, November 22, 2012 10:46:22 AM UTC-5, NMU wrote:
>
> Hello,
>
> I have a column chart being populated with dynamic data. When a value is 
> nullI I add Data not available in the tooltip for that series/point or 
> column. If the chart is converted to a line, the tooltip shows the series 
> colour followed by the "Data not available" label. But when using a column 
> chart, the tooltip omits the series completely. I am using 
> focusTarget:'category' so the other series will show but the null value 
> won't. How can i get the column tooltip to show the null label?
>
> Thanks.
>

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