Yes, you can't use TinyMCE with PHP code -- it translates the < in the <?php to a web-safe character.
You need to click the button that lets you directly edit the source (it's there in the standard TinyMCE setup) and enter your code that way.
I tried that, but there seem to be several things it trims out. Like, on one page I'm trying to add html for a form. Any form elements, it just deletes out. Is there a setting to allow all html tags?
- jody