Header Group for Tree Component in FPM SAP

Hi,

I am new to FPM and developing a FPM object using Tree component to show the output table in Hierarchy. There are 10 columns in my table and they want a common header for first 4 columns and another common header for next 6 columns.

ex:

--------------------------------------------------------------------------------------------

         header1                       |        header 2

--------------------------------------------------------------------------------------------

Col1 | Col2 | Col3 | Col4       | Col 5 | Col 6 | Col 7 | Col 8 | Col 9 | Col10

--------------------------------------------------------------------------------------------------

Can any one please help me in this. I tried SP_GROUP in field catalog of feeder class but its not showing it in output. Is there any other way that I can do it.