There is a new tutorial on the CA wiki that shows how you can add a toolbar to your container. The article assumes you are writing SWT/Eclipse Java code. This toolbar shows up conditionally in the Composite Application Editor (and does not show in the applications run time). The toolbar allows you to provide an intuitive user interface to configure your component. You can pretty much do anything in the toolbar – from defining values for preferences to launching full dialogs right from the main CAE UI. The idea is to have most of your component editing done “on the glass” versus going into the components preferences or advanced settings.
Reference article is here.