One possible option in this case would be to manipulate the underlying datasource directly - either set null values, or remove the entries. The reason for this is twofold. On one hand, manipulating the visual elements will not bring the desired results. And second, since the chart is correlated to the underlying data, it is best to preserve this correlation. Thus, you can use a separate datalayer, to hold all "valid" values, and bind the chart to it.
I hope that this is a feasible approach for you.
the Telerik team
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