The string parameter that you use to add a color blend is not a real property. It does not matter whether you will call it BaseColor, BaseColor1 or FakeColor. It is important to use one string parameter in the AddColorBlend method and then the same parameter to get a ThemeProperty. This associates the base color with the color that should replace the base color.
I hope this helps.
Best wishes,
Nikolay
the Telerik team
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