How would i merge the columns in a specified row in my flexgrid?

Aparently this doesn't work...
VB Code:
  1. 'merge

  2.                 .Row = COUNT

  3.                 .MergeCells = MSFlexGridLib.MergeCellsSettings.flexMergeRestrictColumns

  4.                 .set_MergeCol(0, True)

  5.                 .set_MergeCol(1, True)

  6.                 .set_MergeCol(2, True)

Any ideas?

Thanks in advance!