Choose the "Custom Identity Manager Objects" in the Project window.
In the NetBeans menu, choose IDM / Open Object.
In the Open Object page, do this:
Object Name: * Object Type: <select an object, ex:Resource>
You will see that the list of Matching Objects gets populated with the objects of the selected type. In this example, if you select SunAccessManagerRealm, and OK, the object-definition will be downloaded to the project.