QML Filedialog doesn't work properly on BB10 (Z10)

Example Code:

import QtQuick 2.0
import QtQuick.Dialogs 1.0

Rectangle {
width: 200
height: 200
FileDialog {
id: fileDialog
title: "MyTitle"
selectFolder: false
selectMultiple: false
onAccepted:

{ var urls = fileDialog.fileUrls console.log(urls) }

}
MouseArea

{ anchors.fill: parent onClicked: fileDialog.open() }

}

First Bug: Filedialog only opens once on my Z10. So if I close the dialog,
it doesn't open again
Second Bug: Filedialog doesn't return anything -> console.log is empty
Third Bug: If I set selectFolder to true, I still can only choose files
Forth Bug: If I set selectMultiple to true, I still can only choose 1 file

greets