QtQuick 2 ComboBox transform scale - popup not scaled

Hello,
I have ComboBox and do Scale transform on main QML object.
ComboBox and all children are scaled accordingly but unfortunately pop-up of ComboBox is not scaled.

I tried signals like on main object and on ComboBox:

Code:

---

onScaleChanged: {
        console.debug("scale changed")
    }

---

and

Code:

---

onTransformChanged: {
        console.debug("transform changed")
    }

---

that gives me an error:

Quote:

---

Cannot assign to non-existent property "onTransformChanged"
onTransformChanged: {
^

---

How would I go about scaling popup?