I have this Dialog:
           Component {
                id: addbambino
                Dialog {
                    id:addbambinoDialog
                    Text {
                        text: i18n.tr("Nome bambino:")
                    }
                    TextField {
                        id: addName
                        objectName: "addName"
                    }
                    Text {
                        text: i18n.tr("Peso bambino:")
                    }
                    TextField {
                        id: addWeight
                        objectName: "addWeight"
                        inputMethodHints: Qt.ImhFormattedNumbersOnly
                    }
                    Button {
                        color: "green"
                        text: i18n.tr("Aggiungi questo bambino")
                        onClicked: {
                            page1.addNameVar = addName.text
                            page1.addWeightVar = addWeight.text
                            PopupUtils.close(addbambinoDialog)
                        }
                    }
                    Button {
                        text: i18n.tr("Annulla")
                        onClicked: PopupUtils.close(addbambinoDialog)
                    }
                }
            }

and this button inside a BottomEdge

                     Button {
                        text: i18n.tr("OK")
                        width: 0.85*parent.width
                        x: (parent.width-this.width)/2
                        y: units.gu(15)
                        color: "green"
                        onClicked: {
                            if (page1.bambinoSelez == 4) {
                                PopupUtils.open(addbambino)
                                pers0.text = page1.addNameVar
                                pers0.text  = page1.addWeightVar
                            }
                         }