This article is a legacy article. It applies to previous versions of the Liferay product. While the article is no longer maintained, the information may still be applicable.
While using Internet Explorer 8 Compatibility mode, some of the CKEditor tool bar options are missing and thus unable to be used.
Resolution
The issue has been resolved in 6.0 EE SP2 as the CKeditor has been updated to version 3.5.3.
To resolve the issue, consider upgrading to Liferay Portal 6.0 EE SP2 or the latest Liferay version.