Cycle bokeh's tabs with CustomJS

cycle_tabs.py

from bokeh.io import save
from bokeh.plotting import figure
from bokeh.layouts import column
from bokeh.models import CustomJS
from bokeh.models.widgets import Button, Tabs, Panel

def make_tab(color):
    p = figure()
    p.scatter([0], [0], color=color, radius=1)
    return Panel(title="Tab: %s" % color.capitalize(), child=p)

red   = make_tab("red")
green = make_tab("green")
blue  = make_tab("blue")

tabs = Tabs(tabs=[red, green, blue])

next_tab = CustomJS(args=dict(tabs=tabs), code="""
    tabs.active = (tabs.active + 1) % tabs.tabs.length
""")
button = Button(label="Next tab", callback=next_tab)

save(column(button, tabs))