We have already answered your support ticket on the same matter and I am adding the same information here for anyone else that may have the same issue:
In Q2 2012 we reduced the CSS used by RadEditor by adding more cascades instead of duplicating code and so the external HTML element that hosts the toolbar needs the RadEditor and <RadEditorSkin> CSS classes applied to it. In the common case, these classes are present in the main RadEditor wrapping element, so in the custom case when the toolbar is outside of the RadEidtor built-in rendering the developer has to add them.
You can see this in action in the following demo: http://demos.telerik.com/aspnet-ajax/editor/examples/dockingzone/defaultcs.aspx
and here is the sample code that does this:
skin = editor.get_skin();
toolbarDiv = $get(
where this is attached to the OnClientLoad event of the RadEditor control and the "outerdiv" is the client-side ID of the targeted HTML element.
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