NEURON python Graph() is blank

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When using python interface for NEURON, when I create a g=h.Graph() object in python, with g.addvar(...) to plot a variable, clicking Init & Run results in an empty Graph:

enter image description here

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After creating the Graph() object, also add it to the global graphList. It will then be updated during run():

g = h.Graph()
g.addvar(...)

h.graphList[0].append(g)

h.run()

enter image description here