title: findNavController is missing and not working
body: <p>i was doing this <a href="https://youtu.be/GOpeBbfyb6s?t=1405" rel="nofollow noreferrer">https://youtu.be/GOpeBbfyb6s?t=1405</a> with navigation arch but i cant type it.findNavController it is showing red</p>
  
  <pre><code>override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
      super.onViewCreated(view, savedInstanceState)
      lgnbtn.setOnClickListener {
          val nameBundle = Bundle()
          nameBundle.putString("name",idfield.text.toString())
          it.findNavController().navigate(R.id.mainFragment, nameBundle)
      }
  }
  </code></pre>