title: Python 3 figure subplot only shows one plot
body: <p>I have the following code for which only ax3 displays the plotting area and data. Subplots ax1 and ax2 display a plot area but no data. Ultimately, I want three plots (3, 1 configuration) with sharex=True. I'm using Python 2.7.2 and matplotlib 1.2.1</p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  
  f, (ax1, ax2, ax3) = plt.subplots(3, 1, sharex=True, sharey=False)
  f.subplots_adjust(wspace=0)
  
  N = 4
  ind = np.arange(N)
  
  width = .4
  group_names = ('A', 'B', 'C', 'D')
  
  q2 = [84, 21, 10, 4]
  q4 = [69, 34, 22, 0]
  q6 = [66, 28, 17, 2]
  
  colors = ['c', 'purple', 'g', 'red']
  
  ax1 = plt.barh(ind, q2, width, color=colors)
  plt.yticks(ind+width/N, group_names)
  plt.ylim([min(ind)-0.25, max(ind)+0.65])
  plt.xticks(np.arange(0, 110, 10.))
  plt.xlim(0, 100)
  
  ax2 = plt.barh(ind, q4, width, color=colors)
  plt.yticks(ind+width/N, group_names)
  plt.ylim([min(ind)-0.25, max(ind)+0.65])
  plt.xticks(np.arange(0, 110, 10.))
  plt.xlim(0, 100)
  
  ax3 = plt.barh(ind, q6, width, color=colors)
  plt.yticks(ind+width/N, group_names)
  plt.ylim([min(ind)-0.25, max(ind)+0.65])
  plt.xticks(np.arange(0, 110, 10.))
  plt.xlim(0, 100)
  
  plt.show()
  </code></pre>