CKEditor equivalent of OnSelectionChanged event

Hi,

Were converting from FCKEditor to CKEditor. We use the OnSelectionChanged event to detect when edits occur within the editor to update other components of the page (such as a submit changes button).

This event nolonger seems to work on CKEditor. I've tried a search of the forums and the docs but the events don't seem to be documented anywhere.

What is the equivalent (or best/correct) method to receive content changed events from CKEditor.

Thanks,

Rob.