Custom Dialog with vidgets pointers to change them programmatically

CustomDialogFragment.tk

class CustDialogFragment(contentLayoutId: Int) : DialogFragment(contentLayoutId) {

    lateinit var tv: TextView
    lateinit var pb: ProgressBar
    
    /**
     * Override to build your own custom Dialog container.  This is typically
     * used to show an AlertDialog instead of a generic Dialog; when doing so,
     * [.onCreateView] does not need
     * to be implemented since the AlertDialog takes care of its own content.
     *
     *
     * This method will be called after [.onCreate] and
     * immediately before [.onCreateView].  The
     * default implementation simply instantiates and returns a [Dialog]
     * class.
     *
     *
     * *Note: DialogFragment own the [ Dialog.setOnCancelListener][Dialog.setOnCancelListener] and [ Dialog.setOnDismissListener][Dialog.setOnDismissListener] callbacks.  You must not set them yourself.*
     * To find out about these events, override [.onCancel]
     * and [.onDismiss].
     *
     * @param savedInstanceState The last saved instance state of the Fragment,
     * or null if this is a freshly created Fragment.
     *
     * @return Return a new Dialog instance to be displayed by the Fragment.
     */
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        //   return super.onCreateDialog(savedInstanceState)
        val builder: AlertDialog.Builder
        if (activity != null) {
            builder = AlertDialog.Builder(requireActivity())
        } else {
            throw IllegalStateException("Activity cannot be null")
        }

        val inflater = requireActivity().layoutInflater
        val rootView = inflater.inflate(R.layout.cdlayout, null)
        tv = rootView.findViewById(R.id.textViewInDiFr)
        pb = rootView.findViewById(R.id.progressBar2)

        builder
            .setView(rootView)
            //.setView(inflater.inflate(R.layout.cdlayout, null))
            //.setView(R.layout.cdlayout)
            // Add action buttons
            .setPositiveButton(
                R.string.positive
            ) { _, _ ->
                Log.e(TAG, "onCreateDialog: Positive clicked!!!!!!!!!!!!!!!!")
                activity?.let { fragmentActivity ->
                    Toast.makeText(
                        fragmentActivity,
                        "Positive Button Clicked",
                        Toast.LENGTH_LONG
                    ).show()
                }
            }
            .setNegativeButton(
                R.string.negative
            ) { _, _ ->
                Log.e(TAG, "onCreateDialog: Negative clicked!!!!!!!!!!!!!!!!")
                activity?.let { fragmentActivity ->
                    Toast.makeText(
                        fragmentActivity,
                        "Negative Button Clicked",
                        Toast.LENGTH_LONG
                    ).show()
                }
            }
        return builder.create()
    }
}