Problem with property bool

[qba10]

Hi
This is my code:

import Qt 4.7
 
Item {
 
    width: 180
    height: 60
    id: root
 
    property bool collapsedButton: true
(...)
    ParallelAnimation {
        running:root.collapsedButton
        NumberAnimation { target: backgroundCallapsed; property: "width"; to: 64 ;}
        NumberAnimation { target: background; property: "opacity"; to: 0 }
        NumberAnimation { target: text; property: "opacity"; to: 0 }
 
    }
(...)

import Qt 4.7

Item {

    width: 180
    height: 60
    id: root

    property bool collapsedButton: true
(...)
    ParallelAnimation {
        running:root.collapsedButton
        NumberAnimation { target: backgroundCallapsed; property: "width"; to: 64 ;}
        NumberAnimation { target: background; property: "opacity"; to: 0 }
        NumberAnimation { target: text; property: "opacity"; to: 0 }

    }
(...)

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Thie code does not work, but when I change "root.collapsedButton" form running to "true" this script work