[QGIS-Developer] How to turn on CustomLayerOrder (PyQGIS)

[coder]

Hello
I'm trying to change the rendering order for the layers in the canvas with 
the aid of QgsLayerTree. The code grabs each layer, checks whether is a 
QgsMapLayer instance, and generates a reordered list (layersII). Then, the 
code executes:
QgsLayerTree().setCustomLayerOrder(layersII)
but nothing happens and
print (QgsLayerTree().hasCustomLayerOrder()) 
returns False. The API documentation 
(https://qgis.org/pyqgis/master/core/QgsLayerTree.html) indicates that 
customLayerOrder will only be used when hasCustomLayerOrder is True. I'm 
missing something here but after browsing and googling, I just haven't 
figured out how to make the change in rendering order active. Thanks. 
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