Hello Stuart,
You can import your own CSS file in the RadEditor's dialogs through the DialogsCssFile property.
Another way to customize the dialogs is to copy the
EditorDialogs folder and set the
ExternalDialogsPath property to point to it. After that modify the CellProperties.ascx file and hide the desired controls in it.
More information is available
here.
Best wishes,
Rumen
the Telerik team
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