title: How to reindex_axis Pandas Panel to MultiIndex
body: <p>I have a 3D panel data.
  I am unable to reindex it to a multi index along level 2.</p>
  
  <p>I have created the multi index 'mind'.</p>
  
  <pre><code>import pandas as pd
  
  mind = pd.MultiIndex.from_arrays([['Consumer,Cyclical','Industrial','Software'], ['Retail','MiscellaneousManufactur','Technology'], ['AZO','AZZ','AZPN']],names=['sec','sub','ticker'])
  
  dfclose = pd.DataFrame([[1.1,2.1,3.1],[1.2,2.2,3.2]], index=['2013-09-02','2013-09-03'], columns=['AZO','AZZ','AZPN'])
  dfmean = dfclose - dfclose.mean()
  
  pdata2 = pd.Panel({'close':dfclose, 'mean':dfmean})
  pdata2.minor_axis.name='ticker'
  pdata3=pdata2.reindex_axis(mind,axis=2,level='ticker')
  </code></pre>
  
  <p>But the pdata3 is not getting mapped to the new multi index and giving NaN.</p>