def add_subplot(self, subplot_name):
pos = 1 + len(self.subplots )
print subplot_name, self.n_rows, self.n_cols,pos
obj = self.figure.add_subplot(self.n_rows, self.n_cols, pos)
GraphicsUnit.add_subplot( self, subplot_name, plot_unit = PyplotUnit( plot_object = obj ) )
