ApplicationWindow inside C++ childwindow (not new window)

[anda_skoa]

My ApplicationWindow {} did not have a contentItem

Ok, so you had an empty window with just the ToolBar, I though that you maybe already had some content in your window.

In QtQuick, to show something you only need to instantiate it, potentially provide values for size if it doesn't have an implicit one.

import QtQuick 2.0
 
Rectangle {
    width: 100
    height: 100
 
    color: "blue"
}

import QtQuick 2.0

Rectangle {
    width: 100
    height: 100

    color: "blue"
}

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Cheers,
_