See the description of the objectPanel extension.
The source code of the plugin, together with comments and an instruction for development and installation, is here.
The plugin is in the dcore-app-extension-op-test directory.
The implementation displays an additional tab for all object types except group publications. The object type, name, and identifier are displayed on the tab. There is also a button there for simulating an introduction of changes – the user can confirm or cancel the changes – and a control element which describes the status of those changes. The additional tab looks as shown in the image below:
