it is not possible to set the Theme
in the declaration of the control templates. I think that the easiest and better way is to work with Skins. Thus, after you have created some skins you will be able to set them to each template using the Skin
property of the RadEditor( let's assume we are discussing for this control.). You could create a new skin (let's say EditorCustomSkin.css) and add it to the following directory: ~\Sitefinity\Admin\Themes\Default\AjaxControlsSkins\Sitefinity\EditorCustomSkin.css
Then, import the skin in the RadControlsSkins.css
file (~\Sitefinity\Admin\Themes\Default\RadControlsSkins.css) and set the Skin property in the RadEditor declaration of the desired template.
I hope this helps.
the Telerik team
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