2 December 2009 at 8:34pm
The HTMLEditorField doesn't work in popups. UncleCheese has several working WYSIWYG Editors bundled with his DataObjectManager module though:
.. and also a SimpleTinyMCEField which uses TinyMCE as editor. The last one is the most recent addition and not (yet) on the doc wiki. I suggest you use the SimpleTinyMCEField, it seems to be the best of the three.