It is very difficult to use subclassed InterviewEditor into custom BasicSessionControl successor

So, on the talk to Dima F., we suggest to do the following:

1. Need a method
  protected InterviewEditor BasicSessionControl.createEditor()
and extract the code:
==============
        interviewEditor = new InterviewEditor(parent, getUIFactory(), ip);
        if (cm != null) {
            interviewEditor.setCustomRenderers(cm.getCustomRenderersMap());
            interviewEditor.setContextManager(cm);
        }
==============
2. update existing method BasicSessionControl.initEditor() to call
interviewEditor=BasicSessionControl.createEditor() instead of explicit
constructor call.