This is interface to the standard feature, which is disabled by default and explained in the documentation on codex wordpress org https codex wordpress org TinyMCE Custom Styles.
With presets we plan to add popular CSS framework classes to be able to use them inside the editor..
Open TinyMCE Styles page and add your options..
This is great little plugin that lets developers add specific class elements that any WYSIWYG user can use without needing to go into the code to add element to required tag..
With options to have class title that makes sense to anyone, plus the ability to add the class to selector or name to specific tag just makes it so easy to use in WYSIWYG editor..
The ability to add additional styles is bonus, however I tend to leave those blank have the editor css file contain the styles predefined.
While that does work this plugin allows you to have full control of all editor classes you want to use within the editor that are easier to use and to match your front end styles..
You may need to experiment little to get the correct class added to your required tag, but once it's all done WYSIWYG TinyMCE Editor is so much more useful..
The main benefit of this is that you can be sure you adding the required class to the YOU want..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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