Created attachment 257749 [details]
See the following links with developers trying to use their own editor using contenteditable and having troubles with the "native" toolbar that is placed on top of contenteditable and that hides the toolbar provided by the 3rd party WYSIWYG editor.
Note that in case of CKEditor, the problem is not only in the confusion caused by another toolbar overlaying the toolbar provided by CKEditor, but also with some features that should not be included in the toolbar offered by the native browser.
For example in case of CKEditor, it is possible to configure it to not accept e..g <strong>/<b> elements. In such case the Bold/Italic/Underline menu available for the end user is introducing additional confusion.