How to add/remove pages to the favorite list page?

[edip]

Hello. I have list menu and there are many apps. So I have Favorite tab page in order to insert some pages to it. When the user is in a page and clicks on the favorite star icon, the page should be added to the favorite list page. I have two examples here.
First example is working, when clicking on favorite action it adds the page dynamically. When again clicking the action it removes the page.
Second example is not working. It has a page in ApplicationWindow, when entering the page and clicking the favorite action it doesn't work. I used the same method with the first app. Could anybody help me about this?
Here is the short video of two examples.
First Example:
main.qml

import QtQuick 2.6
import QtQuick.Controls 2.2
import QtQuick.Controls.Material 2.0
import QtQuick.Layouts 1.3
import Fluid.Controls 1.0
import QtQuick.Window 2.3
import Qt.labs.settings 1.0
ApplicationWindow{
    id:main
    width: 640
    height: 480
    visible:true
    title: "Favorites"
    property string datastore: ""
    property int countt2: 0

    Settings{
        property alias datastore: main.datastore
        property alias mycount: main.countt2
    }

    Component.onCompleted: {
        if(datastore){
            dataModel.clear()
            var datamodel=JSON.parse(datastore)
            for (var i=0; i<datamodel.length; ++i) dataModel.append(datamodel[i])
        }
    }
    onClosing: {
        var datamodel = []
        for (var i=0;i<dataModel.count; ++i) datamodel.push(dataModel.get(i))
        datastore=JSON.stringify(datamodel)
    }
    initialPage:TabbedPage {
        title: main.title
        actions: [
            Action {
                id:action2
                text: qsTr("Settings")
                icon.name: "toggle/star"
                onTriggered:{
                    countt2++
                    console.log("triggered works.Count/2: "+ countt2%2)
                    if(countt2%2==1){
                        console.log("it must be added")
                        dataModel.append({ "title": "Application Tools" })
                    }
                    else if(countt2%2==0){
                        console.log("list must be removed. count/2: "+countt2%2)
                        return dataModel.remove(dataModel.index)
                    }
                }
            }
         ]
    }
        ListView {
            id:malist
            width: parent.width
            height: parent.height
            focus: true
            interactive: true
            clip: true
            model:FavModel{
            id:dataModel
            }
            delegate: ListItem {
                text: model.title
            }
        }
}

FavModel.qml:

import QtQuick 2.0

ListModel{
        id:dataModel
}

Second Example:
main.qml:

import QtQuick 2.6
import QtQuick.Controls 2.2
import QtQuick.Controls.Material 2.0
import QtQuick.Layouts 1.3
import Fluid.Controls 1.0
import QtQuick.Window 2.3
ApplicationWindow{
    id:main
    width: 640
    height: 480
    visible:true
    title: "Example App"
    initialPage:TabbedPage {
        title: main.title
        Tab{
            title:"APPS"
        ListView {
            id:malist
            width: parent.width
            height: parent.height
            focus: true
            interactive: true
            clip: true
            model:ListModel {
            id:appModel
            ListElement { title: qsTr("Page1"); source: "qrc:/Angle_convert2.qml" }
            }
            delegate: ListItem {
                text: model.title
                onClicked: pageStack.push(model.source)
            }
        }
        }
        Favourites{}
    }
}

Favorites.qml:

import QtQuick 2.6
import QtQuick.Controls 2.0
import QtQuick.Controls.Material 2.0
import Fluid.Controls 1.0
Tab{
    title:"FAVORITES"
ListView {
    id:favorites
    width: parent.width
    height: parent.height
    focus: true
    interactive: true
    clip: true
    model:FavModel {
    id:favModel
    }
    delegate: ListItem {
        text: model.title
        onClicked: pageStack.push(model.source)
    }
}
}

FavModel.qml:

import QtQuick 2.0

ListModel{
        id:dataModel
}

Angle_convert2.qml:

import QtQuick 2.9
import QtQuick.Controls 2.2
import QtQuick.Controls.Material 2.2
import Fluid.Controls 1.0
import Qt.labs.settings 1.0
Page{
    title:qsTr("Page1")
    appBar.maxActionCount: 2
    id:angconv
    property string datastore: ""
    property int countt2: 0
    Component.onCompleted: {
        console.log("onComponent works right now.")
        if(datastore){
            dataModel.clear()
            var datamodel = JSON.parse(datastore)
            for (var i=0; i<datamodel.length; ++i) dataModel.append(datamodel[i])
        }
    }
    onCanGoBackChanged: {
        var datamodel=[]
        for (var i=0; i<dataModel.count; ++i) datamodel.push(dataModel.get(i))
        datamodel = JSON.stringify(datamodel)
    }
    Settings{
        id:mysetting4
        property alias datastore: angconv.datastore
        property alias mycount: angconv.countt2
    }
    FavModel{
        id:dataModel
    }
    actions: [
        Action {
          id:favourite2
            onTriggered:{
                countt2++
                console.log("triggered works.Count/2: "+ countt2%2)
                if(countt2%2==1){
                    console.log("List must be added")
                    dataModel.append({ "title": "Application Tools" })
                }
                else if(countt2%2==0){
                    console.log("List must be removed. count/2: "+countt2%2)
                    return dataModel.remove(dataModel.index)
                }
            }
            text: qsTr("Favourite")
            icon.name: "toggle/star"
            toolTip: qsTr("Favourite")
        }
    ]
}