How the Lable binds the button without any flirking or jumping?

[jbbs]

I have a question regarding on the button and label.
i don't know why when the mouse cursor points on the button, i see the button is flirking. is there anyway to make it not behave like that?
because i want to highlight the text above the button when i click on it.
can anyone help me out . Thank You


the code is following:
############################################
# File: toolbar1.py

from Tkinter import *
root = Tk()


def callback():
print "called the callback!"
def cool():
destroy()

BLU = "#000000008800"
GRN = "#009900"
# create a toolbar
toolbar = Frame(root, width=10, height=1, bg='white')
toolbar.pack(expand=YES, fill=BOTH)

b = Button(toolbar, text="", width=6, height=1, relief='raised',bd=8, bg=BLU,fg='white',font=('Arial', 14), command=callback)
b.pack(side=LEFT, padx=30,expand=YES, fill=NONE)
b.bind('<Button>', cool)

c = Label(b, text = 'Number:' , fg='white', font=('Arial',14))
c.config(width=6, height=1, bg=BLU)
c.pack(expand=NO, fill=BOTH, side=TOP)
c.bind('<Button>', cool)

d = Label(b, text = '3' , fg=GRN, font=('Arial',14))
d.config(width=6, height=1, bg=BLU)
d.pack(expand=NO, fill=BOTH, side=TOP)
d.bind('<Button>', cool)

f = Button(toolbar, text="", width=6, height=1, relief='raised',bd=8, bg=BLU,fg='white',font=('Arial', 14), command=callback)
f.pack(side=RIGHT, padx=20, pady=20)
f.bind('<Button>')

g = Label(f, text = 'Number:' , fg='white', font=('Arial',14))
g.config(width=6, height=1, bg=BLU)
g.pack(expand=NO, fill=BOTH, side=TOP)
g.bind('<Button>')

h = Label(f, text = '0' , fg=GRN, font=('Arial',14))
h.config(width=6, height=1, bg=BLU)
h.pack(expand=NO, fill=BOTH, side=TOP)
h.bind('<Button>')

toolbar.pack(side=TOP, fill=X)


mainloop()
###########################################