How to select multiple values in listbox Tkinter?

There are three listbox, each of the values. Unfortunately, when I select something in one, the other selection disappears. How to make so that you can select items in three listbox?
June 5th 19 at 21:04
1 answer
June 5th 19 at 21:06
The experience of using TKinter and GTK I would choose the second - it has less problems in this regard.

I understand the allocation ceases to be prominent when focus is lost, and it generally persists?
Probably need to catch the event when the mouse left the control(or loss of focus) and to change the background of selected items(or to allocate them differently). A crutch of course, but I think the problem is in the TK.

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