tablix colgroups inner row - do not show if

Hi,

i think i have an uderstanding problem with colgroups.

i have 2 possible colgroups.

the inner rowgroup should no sho parallel - f.e. left colgroup is empty, right colgroup has data.

another try to explain:

I have colroup A und B.
If there is a resultrow for B, then the row will be displayed in rowgroup B.
But at the same row, there will nothing be displayed in colgroup A ... i think because this row is parallel everytime.

but this means. that you everytime get on the left or on the right colgroup .... you get an empty col.

f.e.

Col A Col B

result 1 empty

result 2 empty

empty result 3

empty  result 4

empty result 5

--

But i want to get this:

Col A Col B

result 1 result 3

result 2 result 4

result 5

This means that the inner row (detail) will not show only 1 result (in the right colgroup) and in the other colgroup create an empty cell.

Do you understand?

I hope there will be help 4 me. THX, Gr. Pit