QtWinExtras TaskbarButton Progress not turning red

[qratman]

Hi,

For some reason I can't set the programs taskbar progress indicator red as documented here and here. Setting paused to true
works fine by turning the color yellow.

import QtWinExtras 1.0
 
ApplicationWindow{
...
    TaskbarButton{
        id: taskbar
        progress.visible: true
        progress.stopped: true // should turn it red
        progress.value: 95
    }
...
}

import QtWinExtras 1.0

ApplicationWindow{
...
    TaskbarButton{
        id: taskbar
        progress.visible: true
        progress.stopped: true // should turn it red
        progress.value: 95
    }
...
}

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The runtime output is: qrc:/main.qml:8 Invalid property assignment: "stopped" is a read-only property

How can I see inside the QtWinExtras module to make sure how it is defined?

The Qt version I am using is: 5.4.1