ListView does not call populate, add, remove, or any other transitions

I have following ListView:

Code:

---

import QtQuick 2.5
import QtQuick.Layouts 1.2
 
import si.mikroelektronika 1.0
 
Item
{
    id: ueCategorySelector
 
    clip: true
 
    Rectangle
    {
        id: ueCategorySelectorWrapper
 
        radius: 16
        gradient: Gradient
        {
            GradientStop
            {
                position: 0
                color: "#ffffff"
            }   // GradientStop
 
            GradientStop
            {
                position: 1
                color: "#000000"
            }   // GradientStop
        }   // Gradient
 
        border.color: "#4682b4"
        border.width: 1
 
        antialiasing: true
 
        anchors.fill: parent
 
        ColumnLayout
        {
            anchors.margins: parent.radius/2
 
            spacing: 0
            antialiasing: true
 
            anchors.fill: parent
 
            ListView
            {
                id: ueCategoryListView
 
                antialiasing: true
 
                orientation: ListView.Horizontal
                clip: true
 
                Layout.fillWidth: true
                Layout.fillHeight: true
                Layout.alignment: Qt.AlignHCenter|Qt.AlignVCenter
                Layout.margins: 8
 
                spacing: 8
 
                populate: Transition
                {
                    NumberAnimation
                    {
                        property: "opacity"
                        from: 0
                        to: 1
                        duration: 100
                    }   // NumberAnimation
                }
 
                Component.onCompleted:
                {
                    model=ueCategoriesModel
                }   // Component.onCompleted
 
                delegate: Rectangle
                {
                    id: ueCategorySelectorDelegate
 
                    radius: 16
 
                    width: 256
                    height: ueCategoryListView.height-2*Layout.margins
 
                    clip: true
 
                    border.color: "#4682b4"
 
                    antialiasing: true
 
                    gradient: Gradient
                    {
                        GradientStop
                        {
                            position: 0
                            color: "#000000"
 
                            ParallelAnimation on color
                            {
                                id: ueCategorySelectorColorAnimation
 
                                loops: 1
                                running: false
 
                                ColorAnimation
                                {
                                    from: "#4682b4"
                                    to: "#000000"
                                    duration: 100
                                }   // ColorAnimation
                            }   // ParallelAnimation
                        }   // GradientStop
 
                        GradientStop
                        {
                            position: 1
                            color: "#ffffff"
                        }   // GradientStop
                    }   // Gradient
 
                    MouseArea
                    {
                        id: ueDelegateMouseArea
 
                        anchors.fill: parent
 
                        onClicked:
                        {
                            ueCategorySelectorColorAnimation.running=true;
                            ueProductsModel.ueUpdateProducts(model.ueRoleId)
                            ueProductSelectorOpacityAnimator.running=true;
 
                            ueCategoryListView.currentIndex=index
                        }   // onClicked
                    }   // MouseArea
 
                    ColumnLayout
                    {
                        anchors.fill: parent
 
                        antialiasing: true
 
                        spacing: 8
 
                        Image
                        {
                            Layout.fillWidth: true
                            Layout.fillHeight: true
                            Layout.alignment: Qt.AlignHCenter|Qt.AlignTop
                            Layout.topMargin: ueCategorySelectorWrapper.radius+4
 
                            fillMode: Image.PreserveAspectFit
 
                            horizontalAlignment: Image.AlignHCenter
                            verticalAlignment: Image.AlignVCenter
 
                            antialiasing: true
                            source: "image://ueCategoriesModel/"+model.ueRoleImage
                        }   // Image
 
                        Text
                        {
                            Layout.fillWidth: true
                            Layout.fillHeight: true
                            Layout.alignment: Qt.AlignHCenter|Qt.AlignBottom
                            Layout.bottomMargin: ueCategorySelectorWrapper.radius+4
 
                            color: "#000000"
 
                            text: model.ueRoleName
                            wrapMode: Text.WordWrap
                            font.family: "Courier"
                            textFormat: Text.RichText
 
                            font.bold: true
                            font.pointSize: 10
 
                            horizontalAlignment: Text.AlignHCenter
                            verticalAlignment: Text.AlignVCenter
                        }   // Text
                    }   // ColumnLayout
                }   // delegate
            }   // ListView
        }   // ColumnLayot
    }   // Rectangle
 
    ListView.onAdd:
    {
        print("Add")
    }
}   // Item

---

Why does ListView not call populate transition?

Sincerely,
Marko