Tkinter Listbox and Checkboxes on same height

I have 2 Listboxes next to each other and I try to create a checkbox for each entry of these Listboxes. Unfortunately, I do not manage to make the checkboxes and listbox elements have the same height/be on the same position, as you can see in the screenshot below.

Do you have any idea how i can modify it to have something similar to checkboxes in a list(which is not possible in Tkinter afaik)? For my Listboxes, I use a customized version of this snippet: http://ift.tt/1yJol13

I hope I explained my problem in an understandable way. Thanks for your help.