Showing Details row and Group row in Single Line

I have 1 detail row 3 different groups in my Report like Group1, Group2 & Group3. If I preview the report the group details are displayed in 3 different lines one by one as follows

Details

               Group1_Name
                                        Group2_Name
                                                                 Group3_Name 

But I would like all 4 sections be displayed in a single line like

Details Group1_Name    Group2_Name     Group3_Name

How to do I achieve this SSRS 2008?