We no longer support RadEditor for MCMS. The RadEditorPlaceholderControl's development is discontinued since the end of 2007, and the control was supported until the end of 2008. This information was sent to all RadEditorPlaceholderControl users in the middle of 2007 and announced on our site as well.
If you would like you can use the solution provided in this KB article: Expanding RadEditor's content area vertically (without using scrollbars) to accommodate all content entered
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