Quicktag does not work properly with WP 2.0

Hi,
I have written a Flash Quicktag Plugin
https://www.ssdesigninteractive.com/ssdesign/?p=82

This plugin works fine with WP-1.5.2

But in 2.0 it only works if the Visual Rich Text editor is Disabled.

Can someone tell me where to find resource or informaation to develop quicktags for WP-2.0?

Thanks