How to force line breaks in Column headers in Matrix visual

Is it possible to add a line break in column headers in Matrix visual ?

For example, right now I have "Forecast Jan", "Forecast Feb" etc and I want to display them as 

Forecast        Forecast

   Jan                  Feb

These are the third level of drill down and the other two levels do not requre any line breaks so I prefer the uses do not have to do this manually every time. 

Please let me know if anyone has any good solution , 

Thanks