Show Columns On Both Matrix Regardless Of Population Of Data

I have used two matrix in one of my reports. One matrix is right above other. Both matrix's columns are allocated for month name. I.e there are 12 columns for each month of the year for each matrix.
column name of the second matrix was hidden. so end user can see only first matrix column name and corresponding data in each matrix.
But the problem is now, when there is no data for perticular month in first matrix, thats month's column does not appear at all.
Lets say there is no data for November in first matrix. so Novem column is missing in first mtrix now. but still Novem column is shown on the second matrix as it has some data, although column name is not shown. I wonder how I can show all the columns of both matrix regardless of population of data.

Thanks