Align Column Groups

I have this kind of data as input for a tablix:

Ticket #    Type    Open Date/Time
1652592    I    17-01-2012 09:36:07
1669067    I    02-03-2012 11:38:29
1329941    R    01-04-2010 15:45:34
1361826    R    07-06-2010 06:46:21

And i want to display it like this:

I                                                                  R
Ticket #     Open Date/Time                         Ticket #    Open Date/Time
1652592    17-01-2012 09:36:07                1329941    01-04-2010 15:45:34
1669067    02-03-2012 11:38:29                1361826    07-06-2010 06:46:21

As the tablix is the same for left and right, i thought i could solve it by using a tablix with Column group on Type and then in that cell use the tablix with the columns Ticket and Open Date. This does not completely work, as it is not correct aligned. It now shows like this:

I                                                                R
Ticket #      Open Date/Time                      Ticket #    Open Date/Time
1652592    17-01-2012 09:36:07                
1669067    02-03-2012 11:38:29                
                                                                 1329941    01-04-2010 15:45:34
                                                                 1361826    07-06-2010 06:46:21

Does anyone know how to solve this?