The appearance of characters in the numeric indicator could be specified with the "TemplatePrefix" property.
Telerik themes provide the "SevenSegs", "HexagonalSevenSegs" and "FontFamily" templates that could be used as template prefix. The "FontFamily" prefix is used by default.
Actually this property specifies the start of data template names. The "HexagonalSevenSegs" data templates contain the names like to the following: "HexagonalSevenSegs0", "HexagonalSevenSegs1", "HexagonalSevenSegs2" etc.
Any character template could be overridden in the resource dictionary. Also you can create own character template set for numeric indicator with names as template prefix plus the character.
The example I have attached overrides the decimal separator templates ("HexagonalSevenSegs.", "FontFamily.").
So, it allows displaying a value of double as time that uses "hh:mm" format.
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