Thank you for contacting us and sorry for the delayed answer.
Unfortunately, you cannot apply other themes to Telerik controls. Telerik has themes for ScrollViewer, ScrollBar, CheckBox, RadioButton, ListBox, TextBox. If you use one of those controls, the Telerik themes will apply to them.
Could you please share with us in more details what exactly your scenario is, so that we can assist you in the best manner.
Looking forward to your reply.
All the best,
the Telerik team
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