/**
* Adds a new entry to the category. Returns the new model object.
*/
protected Object addEntry() {
CreateRequest request = new CreateRequest();
request.setFactory(getCreationFactory());
Command command = getCommand(request);
getCommandStack().execute(command);
Object newObject = request.getNewObject();
// Select the new item after creation
selectEditPart(newObject);
return newObject;
}