I want to subclass ColumnDataSource. However, when trying to use this source for plotting (in a jupyter notebook), I get
Model `NbColumnDataSource’ does not exist. This could be due to a widget or a custom model not being registered before first usage.
The subclass definition is as simple as possible (for now),
Is there a trick to subclassing? When looking at the source code for the source included in bokeh I colud not see one…