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Update README.md

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Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
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@ -75,6 +75,37 @@ del root
## [ttk.Checkbutton](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Checkbutton.html) ## [ttk.Checkbutton](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Checkbutton.html)
![image_checkbutton.png](image_checkbutton.png)
```python
import tkinter as tk
from tkinter import ttk
def changed() -> None:
global variable
print(f"Changed: Now it is set to {variable.get()}")
root = tk.Tk()
width_element: int = 10
InitialValue: bool = True
variable = tk.BooleanVar()
variable.set(InitialValue)
a_button = ttk.Checkbutton(
root, text="Don't press", width=width_element, command=changed, variable=variable
)
a_button.grid(row=0, column=0, sticky="w")
root.mainloop()
del root
```
## [ttk.Combobox](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Combobox.html) ## [ttk.Combobox](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Combobox.html)
## [ttk.Entry](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Entry.html) ## [ttk.Entry](https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/ttk-Entry.html)