How to add functionality to the Protege Welcome Panel

Hi,
I want to add a new functionality in the Welcome Panel.
I know how to add additional repository to the "Open from ... repository" 
- it is explained in the wiki.
Yet, this framework does not work with my repository. I have added actions 
in the File -> Open... menu items to open and save ontologies form my 
special repository of ontologies.
Yet, the Welcome Panel needs also a line like the "Open OWL Ontology from 
URI" that will work with my UI panel.
Where do I define this addition as a plugin?

Thanks,
- Uri

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