'Init Split layout. It\'s more convenient for intercept'

def _initSplitLayout(self):

    self._vpaned = RememberingVPaned(self.w3af, 'trap_view')
    self._vpaned.show()
    self.pack_start(self._vpaned, True, True)
    self._vpaned.add(self.request)
    self._vpaned.add(self.response)
