Tabs Not working

I was trying to create tabs with various widgets in the tabs but it does not appear to work:

from bokeh.models.widgets import Panel, Tabs,Toggle

from import output_file, output_server, show

from bokeh.plotting import figure


startButton = Toggle(label=“Start Test1”, button_type=“success”)

tab1 = Panel(child=startButton, title=“circle”)

startButton2 = Toggle(label=“Start Test2”, button_type=“success”)

tab2 = Panel(child=startButton2, title=“line”)

tabs = Tabs(tabs=[ tab1, tab2 ])