Can not read qml property from C++ when property under binding

[mut]

---------- Mainitem.qml
Qt Code:
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import QtQuick 1.0
 
    Item1 {
    width: 100; height: 100
 
    property string mrprefcolor: itemB.mypreferredcolor  // Binding
 
    ItemA1 {
    id: square
 
    Rectangle {
    color: "red"
    width: 10
    height: 10
    }
    }
 
    itemB {}
    }

import QtQuick 1.0
     
    Item1 {
    width: 100; height: 100

    property string mrprefcolor: itemB.mypreferredcolor  // Binding
     
    ItemA1 {
    id: square
     
    Rectangle {
    color: "red"
    width: 10
    height: 10
    }
    }
     
    itemB {}
    }

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---------- itemB.qml -------------
Qt Code:
Switch view

import QtQuick 1.0
 
    property string mypreferredcolor: "red"
 
    Item2 {
    property length: 6
 
    ItemB1 {
    id: idc
 
    Rectangle {
    color: "red"
    width: 10
    height: 10
    property rectype: 0
    }
    }
 
    }

import QtQuick 1.0

    property string mypreferredcolor: "red"
     
    Item2 {
    property length: 6
     
    ItemB1 {
    id: idc
     
    Rectangle {
    color: "red"
    width: 10
    height: 10
    property rectype: 0
    }
    }
     
    }

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Hello

I'm trying to read the Mainitem.qml mypref property from C++, but it does not work. Is it because the property is binded?
I have tried the following (obj being the current *QObject):

metaObject->property(i).read(obj).toString(); // i is the index of mrprefcolor

and

= obj->property("mrprefcolor").toString();

Any thoughts

Thanks;

Mut.