sological,
Please check the following articles:
CSS Class dropdown Customization
Links treeview Customization
Please check the following properties as well:
Editor.AutoParseClasses Property
Specify whether or not the Cute Editor should automagically parse the CSS classes from EditorWysiwygModeCss and populate all items into CssClass dropdown
Editor.EditorWysiwygModeCss Property
Specifies the location of the style sheet that will be used by the editable area. Multiple Style Sheets are supported. Example EditorWysiwygModeCss="example.css,~/portal.css,/default.css
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