RoundButton {
    x: 876
    y: 530
    text: "pippo"
    onClicked: popupinfo.open()
    Popup {
        id: popupinfo
        width: 300
        height: 150
        modal: true
        focus: true
        anchors.centerIn: parent
        closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutside
        background: Rectangle {
            color: "black"
            radius: 15
        }
    }
}

Button {
        checkable: true
        text: pressed ? "pressed" : (checked ? "on" : "off")
    }

    RoundButton {
        id: rbuttonsize
        anchors.right: parent.right
        anchors.top: parent.top
        anchors.rightMargin: 45
        anchors.topMargin: 45
        checkable: true
        text: checked ? "<>" : "><"
        onClicked: window.visibility = (checked ? "FullScreen" : "Windowed")
        palette {button: "grey"}
    }