Thank you for writing back.
There are two approaches for setting a theme - either set it to a certain control or set it to the whole application.
To apply it to a certain control, after you open and edit the theme, save it as a package. Then load the package to your application and set the loaded theme to a certain control. Refer to the attached video.
Setting a theme to the whole application can be achieved by the following code snippet:
I hope you find this information helpful. Should you need any further assistance, do not hesitate to contact me.
All the best,
the Telerik team
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