There are the difference between StackView of 5.1 and 5.2.0RC1?

[_dmp]

I compile and run my source at Qt5.1 and Qt5.2.0RC1. I have working StackView at 5.1 and dont working at 5.2.0RC1.
Dont work "push".
Was made any changes in this item?
An animation of hide Desktop.qml is working, but DialogYesNo.qml dont showing.

My source:

@Item{
------skipped-----

StackView { 
    id: pagestack_ID
    x:0
    y: 0
    height: 768
    width: 1024

    delegate: StackViewDelegate {
        function transitionFinished(properties)
        {
            properties.exitItem.x = 0
            properties.exitItem.opacity = 1
        }

        property Component pushTransition: StackViewTransition {
            SequentialAnimation {
                ScriptAction {
                    script: { enterItem.opacity = 0; }
                }
                PropertyAnimation {
                    target: exitItem
                    property: "x"
                    from: 0
                    to: -exitItem.width
                }
                ParallelAnimation {
                    PropertyAnimation {
                        target: enterItem
                        property: "opacity"
                        from: 0
                        to: 1
                    }
                    PropertyAnimation {
                        target: enterItem
                        property: "scale"
                        from: 0.6
                        to: 1
                    }
                }
            }
        }
        property Component popTransition: StackViewTransition {
            SequentialAnimation {
                ScriptAction {
                    script: enterItem.x = -enterItem.width
                }
                ParallelAnimation {
                    PropertyAnimation {
                        target: exitItem
                        property: "opacity"
                        from: 1
                        to: 0
                    }
                    PropertyAnimation {
                        target: exitItem
                        property: "scale"
                        from: 1
                        to: 0.6
                    }
                }
                PropertyAnimation {
                    target: enterItem
                    property: "x"
                    from: -enterItem.width
                    to: 0
                }
            }
        }
    }
}

Component.onCompleted: {
    pagestack_ID.initialItem = {item : Qt.resolvedUrl("Desktop.qml"), properties:{}};
}

}@

push to stack
@.......skipped...........
pagestack_ID.push({item:Qt.resolvedUrl("DialogYesNo.qml"), destroyOnPop:true});@