Question : How do I remove 'group on' in VB code for Access 2007 report?

I have 3 Access 2007 reports that I am combining into 1 report: The combined report has the following group/sort by structure :
sort by A
  group on  B
    group on C
      sort by D

If certains conditions exist, I want to remove the group on C and leave the remaining:
sort by A
  group on B
    sort by D

I am attempting to do this in VB.
  Me.Section("GroupHeader0").Visible = False
  Me.Section("GroupFooter1").Visible = False
  Me.GroupLevel(2).ControlSource = "" -- this gives an error

How can I remove a Group By in VB?

Answer : How do I remove 'group on' in VB code for Access 2007 report?

I don't think you can change controlsource property "on-the-fly", while the report is running...

Please post the report if possible..

Thanks.
Zlatko