CellTable with 2 Headers

Hi together, 

I want to Build a CellTable simular to this: 

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

      | HeaderTitle A  | HaederTitle B|

| C  |    D     |    E    | F    | G   | H   |

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

I found a lot of answers to this problem and they all link to this showcase CWCustomDataGrid.

But I don't get it :( in this showcase they are rendering the whole DataGrid but I only want to change the Header. 

The AbstractCellTable renders the right Table only the second headerbar is missing. 

Now I have found the method setHeaderBuilder(). But I have no Idea how to use it the right way?

Thanks in advance 

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