Combobox-Feld-Hintergrund-Änderung Python ⇐ Python

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import tkinter as tk
from tkinter import ttk

class ComboboxColorChanger:
def __init__(self, root):
self.root = root
self.root.title("Combobox Color Change")
self.root.geometry("300x150")

# Create a Combobox
self.combobox = ttk.Combobox(self.root, values=["", "Option 1", "Option 2", "Option 3"], state="readonly")
self.combobox.grid(pady=20, padx=50)

# Bind events to handle user actions
self.combobox.bind("", self.update_combobox_style)

# Initial style configuration
self.set_combobox_background(self.combobox)

def set_combobox_background(self, widget):
"""Set the background color of the Combobox based on its selection state."""
value = widget.get()
style = ttk.Style()

if value == "Option 1": # Option 1 selected
style.configure("Red.TCombobox", fieldbackground="#ffcccc", background="#ffcccc")
widget.configure(style="Red.TCombobox")
elif value == "": # No option selected
style.configure("CyanLight.TCombobox", fieldbackground="#e0ffff", background="#e0ffff")
widget.configure(style="CyanLight.TCombobox")
else: # Other options selected
style.configure("Default.TCombobox", fieldbackground="white", background="white")
widget.configure(style="Default.TCombobox")

def update_combobox_style(self, event=None):
"""Update the style of the Combobox when selection changes."""
self.set_combobox_background(self.combobox)

# Main application runner
if __name__ == "__main__":
root = tk.Tk()
app = ComboboxColorChanger(root)
root.mainloop()

Kann mir bitte jemand erklären, warum dieser Code zum dynamischen Ändern der Hintergrundfarbe einer Combobox nicht funktioniert? Danke