Column headers not aligning properly with table

[menator01]

I've worked on this awhile and can't seem to get it align right and the scrollbar to work at the same time. Widths are right if you uncomment the scrollframe grid. But the scrollbar doesn't work. Maybe you can find a work around.

#! /usr/bin/env python3
import tkinter as tk
from tkinter import ttk

class MyClass:
    def __init__(self, parent):
        self.parent = parent
        self.parent.columnconfigure(0, weight=1)
        self.parent.rowconfigure(0, weight=1)

        self.mainframe = tk.Frame(self.parent)
        self.mainframe.grid(column=0, row=0, sticky='new')
        self.mainframe.grid_columnconfigure(0, weight=3)

        self.headerframe = tk.Frame(self.mainframe)
        self.headerframe.grid(column=0, row=0, sticky='ew')
        for i in range(0, 8):
            self.headerframe.grid_columnconfigure(i, weight=3, uniform='header')


        self.contentframe = tk.Frame(self.mainframe, bg='green')
        self.contentframe.grid(column=0, row=1, sticky='new')
        self.contentframe['relief'] = 'solid'
        self.contentframe['borderwidth'] = 1
        self.contentframe['highlightbackground'] = 'grey65'
        self.contentframe['highlightthickness'] = 1
        self.contentframe.grid_columnconfigure(0, weight=3)


        canvas = tk.Canvas(self.contentframe, bg='pink')
        scrollbar = ttk.Scrollbar(self.contentframe, orient='vertical', command=canvas.yview)
        self.scrollframe = tk.Frame(canvas)


        self.scrollframe.bind(
            '<Configure>',
            lambda event: canvas.configure(scrollregion=canvas.bbox('all'))
        )

        canvas.create_window((0, 0), window=self.scrollframe)
        canvas.configure(yscrollcommand=scrollbar.set)

        # You can comment this out and the scroll fame will work but, it shrinks
        self.scrollframe.grid(column=0, row=0, sticky='news')

        for i in range(0, 8):
            self.scrollframe.grid_columnconfigure(i, weight=3, uniform='test')

        scrollbar.grid(column=1, row=0, sticky='ns')
        canvas.grid(column=0, row=0, sticky='news')
        canvas.grid_columnconfigure(0, weight=3)



        self.headers()
        self.combo_box(40)
        self.entrybox(1, 20, 5)
        self.chkbox(3, 30)
        self.entrybox(6,10, 15)
        self.chkbox(7, 10)





    def headers(self):
        headers = ["Field Name","Field Label","Default Value","ReadOnly","Copy","Mandatory","Sort Order","Remove"]
        col = 0
        for header in headers:
            label = tk.Label(self.headerframe)
            label['text'] = header
            label['relief'] = 'solid'
            label['borderwidth'] = 1
            label['highlightbackground'] = 'grey65'
            label['highlightthickness'] = 1
            label.grid(column = col, row=0, sticky='ew')
            col += 1

    def combo_box(self, howmany):
        for i in range(0, howmany):
            combobox = ttk.Combobox(self.scrollframe)
            combobox.grid(column=0, row=i, sticky='new', padx=1)

    def entrybox(self, col, howmany, padx):
        row = 0
        col = col
        for i in range(0, howmany):
            entry = tk.Entry(self.scrollframe)
            entry.grid(column=col, row=row, sticky='new', padx=padx)
            if row >= 9:
                row = 0
                col += 1
            else:
                row += 1


    def chkbox(self, col, howmany):
        row = 0
        col = col

        for i in range(0, howmany):
            box = tk.Checkbutton(self.scrollframe)
            box.grid(column=col, row=row)
            if row >= 9:
                row = 0
                col += 1
            else:
                 row += 1




def main():
    root = tk.Tk()
    root['padx'] = 10
    root['pady'] = 5
    root['relief'] = 'ridge'
    root['borderwidth'] = 5
    MyClass(root)
    root.mainloop()

if __name__ =='__main__':
    main()