So actually in this image: <https://cl.ly/2p0a1D2D...
# tornadofx
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So actually in this image: https://cl.ly/2p0a1D2D0o3C You see I have multiple roots. But in my code I've done
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root = TreeItem(Voucher("", "",
                            "", "", "", "", persons))
                    isShowRoot = false
Which makes the root invisible so I get my desired view.