CustomItem not displaying on mouse click

[Shashank Bandari <mail shashank-bandari in>]

Hi,
I am trying to use a custom item to draw objects onto the canvas on a 
mouse click. The item is not displayed on mouse click.
However if I minimise the window and then maximise, the item is 
displayed. The code is shown below.

#!/usr/bin/env python
import sys
import pygtk
import string

pygtk.require('2.0')
import gtk
import gobject
import gtk.glade
import goocanvas
import cairo
import os.path

from Objects import GeneratorItem

class MainWindow:
def __init__(self):
  self.edit_state=0
  self.builder = gtk.Builder()
  self.builder.add_from_file("sample_glade.glade")
  self.window=self.builder.get_object("sample_window")
  self.canvas_window=self.builder.get_object("main_canvas") #Scrolled 
Window
  self.canvas=goocanvas.Canvas()
  self.canvas_window.add(self.canvas)
  self.window.show_all()
  
self.canvas.connect("button_release_event",self.canvas_mouse_up,None)

def canvas_mouse_up(self,item,event,cr):
  root = self.canvas.get_root_item()
  item = GeneratorItem.GeneratorItem(x=100, y=100, width=100, 
height=100,line_width=20)
  root.add_child(item)
  self.canvas.request_update()
  self.canvas_window.show_all()

window=MainWindow()
gtk.main()

GeneratorItem is the sample CustomRectItem from the demos directory.

Kindly suggest the points I am missing in the code.



Regards,
Shashank Bandari