def _setup_widgets(self):
btn = ttk.Button(self, text='Enter states and watch')
entry = ttk.Entry(self, cursor='xterm', validate="key")
entry['validatecommand'] = (self.register(self._new_state), '%W', '%P')
entry.focus()
self.update_widgets.append(btn)
entry.validate()
entry.pack(fill='x', padx=6)
btn.pack(side='left', pady=6, padx=6, anchor='n')
self.pack(fill='both', expand=1)
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