NavigationToolbar2GTK not working on hand made subplot instance

Hi John and list,

Sorry to take your time.

from matplotlib.backends.backend_gtkagg import FigureCanvasGTKAgg as FigureCanvas
from matplotlib.backends.backend_gtkagg import NavigationToolbar2GTKAgg as NavigationToolbar

when i do:

   >fig = Figure(figsize=(5,4), dpi=100)|||
   >ax = fig.add_subplot(111) # 1|
   >t = arange(0.0,3.0,0.01)|
   >s = sin(2*pi*t)|
   >canvas = FigureCanvas(fig)|
   >toolbar = NavigationToolbar(canvas, win)|
   >vbox.pack_start(toolbar, False, False)

I can zoom on the figure and it is redrawn.

My problem is i need to create a subplot instance myself:

   >fig = Figure(figsize=(5,4), dpi=100)
   ax = Subplot(fig,111) || # 1||
   t = arange(0.0,3.0,0.01)
   s = sin(2*pi*t)
   fig.add_subplot(ax) ||# 2 -> To display the hand
   subplot in the figure.|
   >canvas = FigureCanvas(fig)
   toolbar = NavigationToolbar(canvas, win)
   vbox.pack_start(toolbar, False, False)|

The application is crashing. GTK seems to fail displaying the canvas.

Is it a bug or am i doing something wrong?

Thanks a lot for the answer,
Philippe Collet