Trying to make it so I can choose stocks with a dynamic map

stock_shower.py

import holoviews as hv
from bokeh.models import CheckboxGroup

from bokeh.sampledata.stocks import AAPL, GOOG
from holoviews import opts
from holoviews.plotting.links import RangeToolLink
import pandas as pd
from holoviews.streams import Stream

hv.extension('bokeh')
renderer = hv.renderer('bokeh')

aapl_df = pd.DataFrame(AAPL['close'], columns=['close'], index=pd.to_datetime(AAPL['date']))
goog_df = pd.DataFrame(GOOG['close'], columns=['close'], index=pd.to_datetime(GOOG['date']))
aapl_df.index.name = 'Date'
goog_df.index.name = 'Date'

aapl_curve = hv.Curve(aapl_df, 'Date', ('close', 'Price ($)'))
goog_curve = hv.Curve(goog_df, 'Date', ('close', 'Price ($)'))

chosen_stocks_stream = Stream.define('Toggle Stocks', active=[0, 1])()


def stocks_callback(active, holder_crv):
    print(f"Callback {active}")
    src = [('aapl', aapl_curve), ('goog', goog_curve)]
    d = {k: v for (i, (k, v)) in enumerate(src) if i in active}
    d['_'] = holder_crv
    print(f"Plts = {d}")
    overlay = hv.NdOverlay(d)

    return overlay


def layout_cb(active):
    # Doing this, because it seems you can't RangeLinkTool with NdOverlay?
    src_crv = hv.Curve([])
    tgt_crv = hv.Curve([])
    tgt = stocks_callback(active, tgt_crv).relabel('').opts(width=800, height=400, labelled=['y'])
    src = stocks_callback(active, src_crv).relabel('').opts(width=800, height=200, yaxis=None, default_tools=[])
    RangeToolLink(src_crv, tgt_crv)
    layout = (tgt + src).cols(1)
    layout.opts(opts.Layout(shared_axes=False, merge_tools=False))
    return layout


def change_active_stocks(attr, old, new):
    layout_cb(active=new)


#Comment the other layout line and uncomment this one and the range tool stops working
#layout = hv.DynamicMap(layout_cb, streams=[chosen_stocks_stream])
layout = layout_cb([0, 1])

checkbox_group = CheckboxGroup(labels=["AAPL", "GOOG"], active=[0, 1])
checkbox_group.on_change("active", change_active_stocks)

renderer.server_doc(layout)