import panel as pn
pn.extension()

menu_items = [('Option A', 'a'), ('Option B', 'b'), ('Option C', 'c'), None, ('Help', 'help')]

menu_button = pn.widgets.MenuButton(name='Dropdown', items=menu_items, button_type='primary')

pn.Column(menu_button, height=200)

menu_button.clicked

def handle_selection(clicked):
    return f'You clicked menu item: "{clicked}"'

pn.Column(
    menu_button,
    pn.bind(handle_selection, menu_button.param.clicked),
    height=200
)

text = pn.widgets.TextInput(value='Ready')

def b(event):
    text.value = f'You clicked menu item: "{event.new}"'
    
menu_button.on_click(b)

pn.Row(menu_button, text, height=200)

pn.Column(*(pn.widgets.MenuButton(name=p, button_type=p, items=menu_items) for p in pn.widgets.MenuButton.param.button_type.objects))

split_menu_button = pn.widgets.MenuButton(name='Split Menu', split=True, items=menu_items, button_type="primary")
pn.Column(split_menu_button, pn.bind(handle_selection, split_menu_button.param.clicked), height=200)

file_items = ["\U0001F4BE Save", "🚪 Exit"]
help_items = ["⚖️ License", None, "\U0001F6C8 About"]
pn.Column(pn.Row(
    pn.widgets.MenuButton(name="File", icon="file", items=file_items, width=75, button_type="light"),
    pn.widgets.MenuButton(name="🧏🏻‍♂️ Help", items=help_items, width=100, button_type="light"),
    styles={"border-bottom": "1px solid black"}
    ), height=200, 
)

pn.Row(menu_button.controls, menu_button)