Hi Josh,
Thank you for the question.
The true and correct ControlDefault theme is contained in the Telerik.WinControls.UI.dll, so you do not need to add a reference to the Telerik.WinControls.Themes.ControlDefault.dll assembly. It has been removed in our latest release.
If you need additional assistance, feel free to contact me.
Sincerely yours,
Nikolay
the Telerik team
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