Interactive plot with Tkinter

I want to control the column y of a matrix Y to plot according to a vector x by swtching with Tkinter buttons. I've tried this but I am unable to dray the graphic and therefore change the column parameter. Any idea ?

Code:

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import numpy
import pylab
import Tkinter
 
pylab.ion()
# Functions definitions:
x = numpy.arange(0.0,3.0,0.01)
y = numpy.sin(2*numpy.pi*x)
Y = numpy.vstack((y,y/2,y/3,y/4))
 
#Usual plot depending on a parameter n:
def graphic_plot(n):
    if n < 0: n = 0
    if n > len(Y): n = len(Y)-1
    fig = pylab.figure(figsize=(8,5))
    ax = fig.add_subplot(111)
    ax.plot(x,Y[n,:],'x',markersize=2)
    ax.set_xlabel('x title')
    ax.set_ylabel('y title')
    ax.set_xlim(0.0,3.0)
    ax.set_ylim(-1.0,1.0)
    ax.grid(True)
    pylab.show()
 
 
def increase(n):
   return n+1
 
def decrease(n):
    return n-1
 
n=0
master = Tkinter.Tk()
left_button  = Tkinter.Button(master,text="<",command=decrease(n))
left_button.pack(side="left")
right_button = Tkinter.Button(master,text=">",command=increase(n))
right_button.pack(side="left")
master.mainloop()