Issue with ckeditor and Form builder Webform UI

Hi,

I have an issue with the ckeditor module and webform builder.
I want to use these two module for my customer, but when i enable form builder and ckeditor, I can t use ckeditor on XHTML Markup or other text field or text area, you can see it on the picture :

But when I disable form builder i can use ckeditor on these field, you can see it on the picture :

I need your help to resolve this issue.

Thanks for your answer.