How to enable to style dropdown box?

Here's an approach that seems to work.
- go to admin/settings/tinytinymce
- edit the init script for advanced mode (for example)
- add the following to theme_advanced_buttons1
theme_advanced_buttons1 : "..., styleselect,...",
- add the following line
content_css: "/path/to/your/sites/stylesheet.css"
- in the stylesheet referenced above any class associated with divs will appear in the dropdown, eg
div.waytoobright {color: yellow; background-color: red;}

I used a stylesheet that is already associated with the theme. I'm not sure if it would work if you referenced a stylesheet not already linked in to Drupal either using a theme or a module.

I hope this helps

I have not tried this but I think you could trick the editor:

Set the content_css parameter as described above and create a stylesheet at that location which has the styles that you want.

When the user selects that style it just creates a div with that class.

You would then need to alter the actual stylesheets which are in use to make sure that they also have your styles defined in them
- method 1 would be to alter one of the default Drupal stylesheets that is always present
- method 2 would be to alter the stylesheets for all the themes that are in use
- method 3 would be to put an @import into all the theme stylesheets which links to a common stylesheet with the classes you want

I hope this makes sense and is of use.

Steve