Unsolved Wizard

[123456789]

I intend to create an assistant, does anyone know of any examples? I can not override buttons

import QtQuick 2.0
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
Page{
    header:HeaderBar{}
GridLayout {
   id : grid
   anchors.fill: parent
   rows    : 12
    columns : 12
    property double colMulti : grid.width / grid.columns
   property double rowMulti : grid.height / grid.rows
   function prefWidth(item){
      return colMulti * item.Layout.columnSpan
    }
    function prefHeight(item){
        return rowMulti * item.Layout.rowSpan
    }

    Rectangle {
        color : 'white'
        Layout.rowSpan   : 10
        Layout.columnSpan: 3
       Layout.preferredWidth  : grid.prefWidth(this)
        Layout.preferredHeight : grid.prefHeight(this)

        Label {
            y:20
            font.pixelSize: 22
            width: parent.width
            elide: Label.ElideRight
            horizontalAlignment: Qt.AlignHCenter
            text: qsTr("Steps")
        }

        Label{
            y:40
            width: parent.width
            elide: Label.ElideRight
            text:"______________________"
            horizontalAlignment: Qt.AlignHCenter
        }


        Label {
            y:90
           id:step1
            font.pixelSize: 15
          width: parent.width
          elide: Label.ElideRight
          horizontalAlignment: Qt.AlignHCenter
            text: qsTr("Step")
        }


        Label {
           y:120
          id:step2
          font.pixelSize: 15
          width: parent.width
           elide: Label.ElideRight
          horizontalAlignment: Qt.AlignHCenter
          text: qsTr("Step")
      }
       Label {
           y:150

           font.pixelSize: 15
            width: parent.width
           elide: Label.ElideRight
            horizontalAlignment: Qt.AlignHCenter
            text: qsTr("Step")
        }
        Label {
            y:180

           font.pixelSize: 15
           width: parent.width
            elide: Label.ElideRight
            horizontalAlignment: Qt.AlignHCenter
            text: qsTr("Step")
        }
        Label {
            y:210

            font.pixelSize: 15
            width: parent.width
            elide: Label.ElideRight
           horizontalAlignment: Qt.AlignHCenter
            text: qsTr("Step")
        }
  }
  Rectangle {
     id:q
      color : 'gainsboro'
       Layout.rowSpan   : 10
       Layout.columnSpan: 9
      Layout.preferredWidth  : grid.prefWidth(this)
       Layout.preferredHeight : grid.prefHeight(this)


        Column {
           id: column
           y:20
            spacing: 20
            anchors.margins: 20
            anchors.left: parent.left
            anchors.right: parent.right

            Label {
             id:center
              font.pixelSize: 22
                width: parent.width
               elide: Label.ElideRight
                horizontalAlignment: Qt.AlignHCenter
               text: qsTr("Initialization")
           }
           Label {
               id:c1
               font.pixelSize: 15
               width: parent.width
               elide: Label.ElideRight
             //  horizontalAlignment: Qt.AlignHCenter
             text: qsTr("Number machine")
            }

       TextInput{
                width: 500
               text:"Required field"
            }

          Label {
                id:c2
               font.pixelSize: 15
                width: parent.width
                elide: Label.ElideRight
                text: qsTr("it is obrigation to insert the machine number")
            }

           Row { // The "Row" type lays out its child items in a horizontal line
               spacing: 60 // Places 20px of space between items
               Rectangle {
                    width: 80;
                   height: 80;
                   //https://www.rapidtables.com/web/color/gray-color.html
                    color: 'gainsboro';
                   y:200

                  Button{
                        text:"< Back"
                   }
               }
                Rectangle {
                    width: 80;
                   height: 80;
                    color: 'gainsboro';
                    y:200

                    Button{
                        id:btn1
                       text:"Next"
                       onClicked:{
                                   //step 1
                                    center.text= "Group "
                                    c1.text="Id Term Group"
                                   c2.text="it is obrigation to insert the ID Term Group"
                                   btn1.visible="false"


                       }

                       Button {
                          x: 326
                           y: 2
                           text: "Cancel"
                          onClicked: {
                               Qt.quit()
                          }
                       }
                    }
               }
            }
  }

       ScrollIndicator.vertical: ScrollIndicator { }
   }

    Rectangle {
        id : greenRect
        color : '#9E9E9E'
      Layout.rowSpan : 2
        Layout.columnSpan : 12
        Layout.preferredWidth  : grid.prefWidth(this)
        Layout.preferredHeight : grid.prefHeight(this)
    }
}

}