def new_map(event):
dialog = Toplevel(widget)
form = Frame(dialog)
Label(form, text='Width:').grid(row=0, column=0)
Label(form, text='Height:').grid(row=1, column=0)
size = [1, 1]
comm = (lambda ix: (lambda event=None: size.__setitem__(ix, wb.get() + (event.char if event else ''))))
wv = IntVar(value=10)
wb = Spinbox(form, from_=1, to=65535, command=comm(0), textvariable=wv)
wb.bind('<Key>', comm(0))
wb.grid(row=0, column=1)
hv = IntVar(value=10)
hb = Spinbox(form, from_=1, to=65535, command=comm(1), textvariable=hv)
hb.bind('<Key>', comm(1))
hb.grid(row=1, column=1)
form.pack()
dialog.transient(widget)
dialog.grab_set()
wb.focus_set()
widget.wait_window(dialog)
create_new_map(wv.get(), hv.get())
