QML plasmoid, pageStack.pop() doesn't work

[Gao Xiang]

The sample qml is easy:
======================================================
import QtQuick 1.1
import org.kde.plasma.components 0.1 as PlasmaComponents
Item {
        PlasmaComponents.PageStack {
                id: pageStack
                anchors.fill: parent
                initialPage: [ c, b, a ]
        }
        PlasmaComponents.Page {
                id: a
                anchors.fill: parent
                PlasmaComponents.Label{ text: "a" }
                onStatusChanged: if(status==PlasmaComponents.PageStatus.Active) 
pageStack.pop();
        }
        PlasmaComponents.Page {
                id: b
                anchors.fill: parent
                PlasmaComponents.Label{ text: "b" }
                onStatusChanged: if(status==PlasmaComponents.PageStatus.Active) 
pageStack.pop();
        }       
        PlasmaComponents.Page {
                id: c
                anchors.fill: parent
                PlasmaComponents.Label{ text: "c" }
        }
}
======================================================
I wish to get a "c" in screen.  But I got a "b".  What's wrong?  Why the 
second pageStack.pop() doesn't work?

Thanks.
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