def __init__(self):
gtk.Window.__init__(self, title='Chem')
#adding a box
box = gtk.Box()
self.add(box)
#packing drawing area to the box
darea = Shapes()
box.pack_start(darea, True, True, 0)
#packing grid to the box
grid = gtk.Grid()
box.pack_end(grid, True, True, 0)
#attaching buttons to grid
buttons = Buttons()
buttons._attach_carbon_buttons(grid)
buttons._attach_connections_buttons(grid)
buttons._attach_organic_functions_buttons(grid)
buttons._attach_search_button(grid)
#adding event
buttons._connect_search_button()
buttons._connect_connections_buttons(darea.draw)
