Combox foreground color issue

[JEdmario16]

How can I remove this white background that appears when I use state="readonly" in the combobox?

without "readonly" code
combox_label = customtkinter.CTkLabel(master=window, text="Event Type")

combobox = customtkinter.CTkComboBox(master=window, values=values, variable=combobox_var) combobox.configure(fg_color="red")

result:

with "readonly" statement:

combox_label = customtkinter.CTkLabel(master=window, text="Event Type")

combobox = customtkinter.CTkComboBox(master=window, values=values, variable=combobox_var)

result: