It's broken us into the key sections - details, a visual tree of the structure, the logic tree and relationships, and, finally the source code. It's a pretty simple process of creating the menu and appending the elements onto it, much like a normal drop down menu. The key is in the set_submenu function, creating a new object for the code to append the submenu elements to. The rest is just simple appends.

They've also included a screenshot to illustrate the end result.

• Accessing geo-nick with Pear XML-RPC - shows how to access the geo-nick web service they created previously with a standard PEAR XML-RPC connection
• Overview of GtkMenubar construcution - a brief look (including some code) of how to work with the GtkMenubar widget and include it in your application.
• Extending GtkToolbar to quickly build toolbars - a look (with code) of how to include the GtkToolbar widget into your application and use its features to create buttons and items with tooltips.