[Python] Binding keys in Mac OS X - Tkinter

I have a code that works perfect in a Ubuntu system. This is just a minimal code based on it:

import tkinter as Tk
import tkFileDialog
import ttk

class AppGUI(Tk.Frame):

def __init__(self, parent):
self.ctrl = False
self.parent = parent
self.centerWindow()
self.initGUI()
self.plot()

def initGUI(self):
# Notebooks
self.notebook = ttk.Notebook(self.parent)
self.frame_one = Tk.Frame(self.notebook) # first page
self.frame_two = Tk.Frame(self.notebook) # second page
self.notebook.add(self.frame_one, text='Notebook 1')
self.notebook.add(self.frame_two, text='Notebook 2')
self.notebook.pack(side = Tk.TOP, fill="both", expand=True)

# Realization frame
self.out_frame = Tk.Frame(self.parent, bd=1, relief=Tk.SUNKEN)
self.out_frame.pack(side=Tk.TOP, fill="both", expand=True)

# Key events
self.key()

def centerWindow(self):
w = 800
h = 800

sw = self.parent.winfo_screenwidth()
sh = self.parent.winfo_screenheight()

x = (sw - w)/2
y = (sh - h)/2
self.parent.geometry('%dx%d+%d+%d' % (w, h, x, y))


def key(self):
# Key events
def press(event):
self.ctrl = True
def release(event):
self.ctrl = False

self.parent.bind('<Control_L>', press)
self.parent.bind('<KeyRelease-Control_L>', release)

def plot1(self):
f = plt.figure(figsize=(1, 1), dpi=300)
c_plot1 = FigureCanvasTkAgg(f, master=self.frame_one)
c_plot1.show()
c_plot1.pack(side=Tk.LEFT, fill="both", expand=True)

def onClickPlot1(event):
if event.inaxes is not None:
if self.ctrl:
print "Control key pressed"
# Do my stuff

c_plot1.mpl_connect('button_press_event', onClickPlot1)

def plot2(self):
# Same stuff for plot 2

def plot(self):
self.plot1()
self.plot2()


def main():
root = Tk.Tk()
app = AppGUI(root)
root.mainloop()


if __name__ == '__main__':
main()


When I run thin in a Ubuntu machine, I can see that whatever Control key I press (left or right control) is correctly binded, as I see the print and the expected visual result. Running the same code in a Mac, on the other hand, I cannot see the print output and, of course, the expected result doesn't happens.

I followed this document to perform the binding. I'm not trying to use the Mac Command key, just the regular left Control.

Are there different biding codes for different systems? This doesn't make sense, but I can't find the problem.

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