title: How to show a bar and line graph on the same plot
body: <p>I am unable to show a bar and line graph on the same plot. Example code:</p>
  
  <pre><code>import pandas as pd
  import numpy as np
  import matplotlib.pyplot as plt
  
  Df = pd.DataFrame(data=np.random.randn(10,4), index=pd.DatetimeIndex(start='2005', freq='M', periods=10), columns=['A','B','C','D'])
  
  fig = plt.figure()
  ax = fig.add_subplot(111)
  
  Df[['A','B']].plot(kind='bar', ax=ax)
  Df[['C','D']].plot(ax=ax, color=['r', 'c'])
  </code></pre>