python 2.7 - Hierarchical index in data frame missing columns -

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im trying learn pandas doing different exercises. created dataframe looks example below. i'm trying create unique id concatenating fields, when data frame columns have fpd column. explain me why don't see columns? 

monthid  pollutantid  processid  roadtypeid  avgspeedbinid     fpd 1        1            1          4           1                1.749101                                              2                0.935300                                              3                0.529701                                              4                0.393052                                              5                0.306381                                              6                0.261649                                              7                0.235040

i data frame executing this: 

fpd =    data['fpd'].groupby([data['monthid'],data['pollutantid'],          data['processid'],data['roadtypeid'],data['avgspeedbinid']]).sum()  fp = pd.dataframe(fpd)

you reset multiindex columns by: 

fp.reset_index(inplace=true)

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