Sam,
EDE is a cutting edge project in its early stage (which Redj is working on lately), and the ToolBar has just been promoted to the 'extras'. The ToolBar might make it to the runtime library soon, I haven't tried to use it yet, we're hoping to add a toolbar to the IDE soon.
I suggest you look at how Redj is using it in EDE/src/ExplorerWindow.ec . It seems simple enough, but keep in mind this interface is subject to change.
Right now you use an 'enum' for the values of each button ID (e.g. ExplorerToolId), an IconBag to specify the bitmap files associated with those IDs, you define the ToolBar instance and override NotifyToolClick to handle each's button's click. The buttons are positioned in the toolbar like regular buttons, those s1, s2, s3 are 'spacers' to separate the buttons. The additional controls you see in the toolbox are some additional button styles defined for use in the ToolBar. They probably come from ToolBar.ec
Hope this helps!
Jerome