from Tkinter import *

# This is a program that tests the placer geom manager in conjunction with 
# the packer. The background (green) is packed, while the widget inside is placed


def do_motion(event):
    app.button.place({'x' : event.x, 
		      'y' : event.y})

def dothis():
    print 'calling me!'

def createWidgets(top):
    # make a frame. Note that the widget is 200 x 200
    # and the window containing is 400x400. We do this
    # simply to show that this is possible. The rest of the
    # area is inaccesssible.
    f = Frame(top, {'width' : '200', 
		    'height' : '200',
		    'bg' : 'green'})

    # note that we use a different manager here. 
    # This way, the top level frame widget resizes when the 
    # application window does. 
    f.pack({'fill' : 'both', 
	    'expand' : 1})

    # now make a button
    f.button = Button(f, {'fg' : 'red', 
			  'text' : 'amazing', 
			  'command' : dothis})
    
    # and place it so that the nw corner is 
    # 1/2 way along the top X edge of its' parent
    f.button.place({'relx' : '0.5', 
		    'rely' : '0.0', 
		    'anchor' : 'nw'})
    
    # allow the user to move the button SUIT-style.
    f.bind('<Control-Shift-Motion>', do_motion)

    return f

root = Tk()
app = createWidgets(root)
root.geometry("400x400")
root.maxsize(1000, 1000)
root.mainloop()