Demo for opening a dialog. I can't set initial directory for the fialog. Is it a bug?

Test.qml

import QtQuick 2.1
import QtQuick.Controls 1.0
import QtQuick.Layouts 1.0
import QtQuick.Dialogs 1.0

ApplicationWindow {
  width:  640
  height: 480

    FileDialog {
      id: theFileDialog
      //folder: folderModel.folder
      selectFolder:   true
      selectMultiple: true
      selectExisting: true
      title: "Add directory to search path"
      onAccepted: {
        console.log(theFileDialog.folder);
        console.log(fileUrl);
     }
    }  

  Button {
    text:   "click"
    onClicked: {
      theFileDialog.folder = "file:///home/kakadu/";
      console.log(theFileDialog.folder);
      theFileDialog.open();
      console.log(theFileDialog.folder);
    }
  }

}