Passing key focus from a component to a sub component - qt

Question

Problem: How do I change the focus from the cornerButton once it is active? Once I navigate up from messageButton to the cornerButton I am not able to navigate back down from there to messageButton.
I thought about creating a property attributes for messageButton in simplePop.qml.... Any thoughts? I think my main issue is that I don't fully understand focus and focuscope
simplePop.qml
Popup {
id: root
property alias cornerButton: cornerButton
property var messageButton
Button {
id: cornerButton
visible: true
focus: true
onClicked: root.closeButtonClicked()
Keys.onReturnPressed: {
clicked()
}
Keys.onEscapePressed: {
hide()
}
Keys.onDownPressed: {
cornerButtonExited()
}
KeyNavigation.down: messageButton
}
This is just a snippet of code to convey my issue. I cannot produce a working example from the larger project. I hope this helps with understanding my issue.
This is simplePop.qml
Popup {
id: root
property alias cornerButton: cornerButton
Button {
id: cornerButton
visible: true
onClicked: root.closeButtonClicked()
Keys.onReturnPressed: {
clicked()
}
Keys.onEscapePressed: {
hide()
}
Keys.onDownPressed: {
cornerButtonExited()
}
}
}
This is main.qml
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
simplePop {
Row {
id: buttonsRow
anchors.horizontalCenter: parent.horizontalCenter
anchors.bottom: parent.bottom
UniButton {
id: messageButton
anchors.top: parent.top
onClicked: {
hide();
}
Keys.onReturnPressed: clicked()
KeyNavigation.up: cornerButton
KeyNavigation.down: callButton.enabled ? callButton : null
KeyNavigation.left: cornerButton
KeyNavigation.right: callButton.enabled ? callButton : null
Keys.onPressed: {
if (event.key === Qt.Key_F2 && callButton.enabled) {
callButton.focus = true
}
}
}
UniButton {
id: callButton
anchors.top: parent.top
onClicked: {
hide();
}
Keys.onReturnPressed: clicked()
KeyNavigation.up: messageButton : null
KeyNavigation.left: messageButton
Keys.onPressed: {
if (event.key === Qt.Key_F1) {
messageButton.focus = true
}
}
}
}
}
}