Commented Issue: HtmlEditorExtender - property contentEditable isn't working in IE7 [27198]

I have a page that if a field is checked, I have to disable the field that contains the HtmlEditorExtender.
Using javascript, I set contentEditable=false.
In IE8 and IE9 it works perfectly, but in IE7 it allows to set focus on field and continue writing and setting styles.

Comments: Almost a month since I reported this issue. Anyone has any idea how to fix it?