Adding wysiwyg (ckeditor) to textarea on node edit form I'm trying to add wysiwyg to a textarea added through CCK.

In my hook_form_alter I can alter the properties of the field no problem. Using this it seems like it should be possible to add 'format' to the element and then use filter_format, it's adds the filter select information but seems to break the body implementation of wysiwyg.

Documentation seems to be pretty sparse on this topic, does anyone know the correct way of implementing this or any complete documentation?
I usually do this by installing better formats module.   This give you the option to set the default format for a cck field when you create it.