Dynamically add widget to column

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Thanks for the quick response, Bryan. I see now that it does work, despite flagging in Pylance in VSCode:

Cannot access attribute "append" for class "List[UIElement]"
  Attribute "append" is unknown Pylance (reportAttributeAccessIssue)
(function) append: Unknown

This typing error usually means the attribute doesn’t exist and the code won’t run. I’ll #type ignore it.

What is Bokeh’s process for getting type checkers to recognize custom Bokeh types? Another one is having the “active” attribute of RadioButtonGroup return a Nullable[int]. It also flags in Pylance.