Hello Jaakko,
The register tags that you have copied apply to the live demos of RadControls only and they are not used by the RadEditor's dialogs.
The header in the Link manager is created by a table and RadTabStrip.
The OK and Cancel buttons in the bottom of the dialog are styled by
RadFormDecorator.
If you would like you can inspect the contents of the different dialogs by registering the external dialogs of RadEditor as shown in the following demo:
Customize Built-in Dialogs. The dialog files are located in the EditorDialogs installation folder.
Best regards,
Rumen
the Telerik team
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