Hello Daniel,
In the current version of RadControls it is not possible to display labels for SeriesItems having YValue of 0 for BarSeries, ColumnSeries, PieSeries and DonutSeries. This limitation is due to visual considerations of the RadHtmlChart.
However, I have logged your idea in our feedback portal
here, so that you can monitor, comment or vote on it, in order to raise its priority. If this idea gets enough votes our developers might consider its implementation in the future.
I have also updated your Telerik points for sharing your feedback with us.
Regards,
Danail Vasilev
the Telerik team
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