TreeView steal focus of ListView scroll

Fheanor

I use a ListView and inside each Item of this ListView, I have a TreeView .

My problem is that when I want to scroll my ListView, if my mouse goes on the TreeView , the focus will change and the scroll will now be on the TreeView instead of the list.

I would like that focus is set on the TreeView only if I click on it.

Code example:

import QtQuick.Controls 1.4

ListView {
    id: list
    ScrollBar.vertical: ScrollBar {}
    ...
    model: DelegateModel {
        id:delegate
        model: myModel
        delegate : Rectangle {
             id: rect
             ...
             TreeView{
                 id: spin 
                 ...
             }
        }     
    }
}

How could I proceed ?