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SomeRoot {
    id: root

    Repeater {
        model: buttons
        delegate: SomeDelegate {}
   }

Component.onCompleted: {
   [].slice.call(root.children, 0, root.children.length - 1).forEach(function (item) { console.warn(item.x) });   
}

Repeater {
    id: repeater

    model: buttons
    delegate: SomeDelegate {}

    Component.onCompleted: {
        for (var i = 0; i < repeater.count; ++i)
            console.warn(repeater.itemAt(i).x);
    }
}