I’ve updated the code to use the core WordPress UI. You can find it here.

I recently worked on a project that required me to add a custom meta box with tabs. In the spirit of GPL, I would like to share my code. The sample plugin checks the admin theme used by the user and enqueues the appropriate stylesheet to match the admin look and feel. The meta box looks and works fine with JavaScript disabled.

Download: Tabbed Meta Box in WordPress

Blue Theme with JavaScript Enabled

Fresh Theme with JavaScript Enabled

Meta Box in the side with JavaScipt Enabled

JavaScript Disabled