Yeah, it's a know problem. The select element ignores the zIndex and stays at the top, there are a few ways to solve this, most common being to hide the select element, while the other method is better. Have a read here...http://dotnetjunkies.com/WebLog/jking/arch.../07/21/488.aspx
PHP-GTK :)I had a play with it a few months ago, just aren't enough resources. Hopefully with the recent release of v2, maybe there will be more websites dedicated to it.