Попробуйте это:
def dinamic_form():
global widgets
global frames
doth=tix.Tk()
doth.title("Результат поиска")
doth.geometry("300x400+250+50")
doth.attributes('-toolwindow', True)
frame=Frame(doth, borderwidth=0, background="#ffffff")
frame.pack(side="top")
canvas=Canvas(frame, borderwidth=0, background="#ffffff")
canvas.pack(side="top")
scroll_doth = Scrollbar(frame, orient=VERTICAL)
scroll_doth.pack(side="right")
frames = []
widgets = []
for i in range(10):
frame = MyTableRow(canvas, borderwidth=2, relief="groove")
frames.append(frame)
frame.pack(side="top", fill="x")