Property alias does not work with grouped properties

$ qmlviewer MyItem1.qml
file:///home/kde-devel/kde/src/KDE/kdepim/runtime/qml/kde/tests/MyItem1.qml:8:29: Invalid alias reference. An alias reference must be specified as <id> or <id>.<property>
property alias textFont : myText.font.family
^

import Qt 4.7

Item {
  width : 200
  height : 200
  property alias textFont : myText.font.family

  Text {
    height : 40
    anchors.centerIn : parent
    id :myText
    text : "Foo"
  }
}