[Python] Creating a bordered Button in Tkinter

I want to create a class for a Tk.Button in a Tk.Frame so that the button can have a border color independent of its background color.

I wrote this code which creates a button in a frame just as I want but I cannot later get or set the text, bcolor and bg of a previously created FrameButton.

I thought I should be able to do this @profile and @bgsetter constructions but these give me an error.

''' import tkinter as tk

class FramedButton(tk.Frame):
def __init__(self, parent, text="HELLO", bcolor="red", *args, **kwargs):
tk.Frame.__init__(self, parent, bg="green", *args, **kwargs)
self.parent = parent
self.button=tk.Button(self, text=text, bg=bcolor, borderwidth=1)
self.button.grid(row=0, column=0, padx=5, pady=5)
self.pack()

root = tk.Tk()
root.title="FramedButton"

fb=FramedButton(root)
fb.pack(padx=10,pady=10)

# but these do not work... what do I need to add/change?
fb.text="WORLD"
fb.bg="blue"
fb.bcolor="yellow"

root.mainloop()


'''

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