Drag window handle for Tkinter?

First of all, this is my current code, essential parts of it:

class WindowDraggable():        
    x = 1
    y = 1
    def __init__(self,label):
        label.bind('<ButtonPress-1>',self.StartMove);
        label.bind('<ButtonRelease-1>',self.StopMove);
        label.bind('<B1-Motion>',self.OnMotion);

    def StartMove(self,event):
        self.x = event.x
        self.y = event.y

    def StopMove(self,event):
        self.x = None
        self.y = None

    def OnMotion(self,event):
        deltaX = event.x - self.x
        deltaY = event.y - self.y
        self.x = root.winfo_x() + deltaX
        self.y = root.winfo_y() + deltaY
        root.geometry("+%sx+%s" % (self.x,self.y))

#root is my window:
root = Tk()

#This is how I assign the class to label
WindowDraggable(label)

#All imports
from Tkinter import *
from PIL import Image, ImageTk
import sys
import re

What I am trying to accomplish is; Make the window draggable by a handle, in this case label. I can't really describe how it behaves now, but it does move the window, simply not following the mouse.

Please bear with me as I am a total newcomer to Python. Any help is appreciated :) A rewrite of the class is okay, I know it's really badly written.

Copyright Notice：Content Author:「Martti Laine」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/7455573/drag-window-handle-for-tkinter