I am creating A 'ScrollStackedCol2D' chart. 
Consider, i have 8 Colums in this chart. 
I need to club the first four and then the next four. 
I can do it by setting the gap width. 
 If i set the gapwidth of 1st and 2nd Bar=2 then i need the gapwidth of 4th and 5th=4 
How i can set it. 
I know then it becomes multiseries chart.I done 'MSStackedColumn2D' chart also.But that is not my requirement,that is not scrollable. 
  
Please help me..