mtTkinter doesn't terminate threads

I need to run some simple function in multi-threading with a Tkinter GUI, so I've tried mtTkinter. Everything works fine except for a particular: even if I just start the GUI and then I close it without touching nothing some thread keeps running. In other words; I have this code: ``` from Tkinter import * root = Tk() #simple GUI code with buttons, labels, text and scrollbars widget ... ... root.mainloop() ``` If I run this code the GUI appears and when I close it this python script ends successfully. Now if I replace Tkinter with mtTkinter ``` from mtTkinter import * root = Tk() #simple GUI code with buttons, labels, text and scrollbars widget ... ... root.mainloop() ``` the GUI appears once again, but if I close it there is still some thread from mtTkinter that keeps running! Any help would be apprecied, thank you in advance and sorry for my bad english!