import flet as ft from controls import TreeView

def main(page: ft.Page): page.add( TreeView( { ft.Checkbox("Security"): { ft.Checkbox("Firewall"): { ft.Checkbox("Local"): {}, ft.Checkbox("Public"): {}, }, ft.Checkbox(label="Password Manager"): {}, ft.Checkbox("Antivirus"): {}, }, ft.Checkbox("Dev", value=True): { ft.Checkbox( label="Show logs", on_change=lambda _: print("This is a test!") ): {}, ft.Checkbox("Take Snapshot", value=True): {}, }, }, set_on_change=True, ) )

ft.app(target=main)

this code might help you!