Hey Valdus, I'm working on writing a full tutorial for this soon which will help a lot.
In the mean time, the essential overrides are:
- Create a new module class that extends AbstractModule
- Register the module class in the .gwt.xml file (you can see how this is done in the out-of-the-box implementation of this file)
- Call the setSection() method from within your new module where you should pass fully-qualified names of your View and Presenter, any permissions associated with the module and what the module title should be (look at existing BLC modules like MerchandisingModule for some examples)