There are two ways to handle this issue - the first would be to parse the doubles to strings ( or alternatively use DateTime values if applicable ), the other possibility would be to assign a label format expression , that would display the values 2 or 3 digits after the decimal point.
Generally, in case you need to use these types of values ( 2011.50, 2011.51, etc. ) as categories , we would recommend using string or parsing them to a string and mapping to XCategory.
All the best,
the Telerik team
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