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C1 FlexGridClassic Merge Headers

I've used a Flex grdi from C1 to display some info.
How can I merge the header from the Grid ? I have two fixed rows and I've set the merge style to FixedOnly. I've merged cells from different rows but I can't merge cell from same row.
I also can't acces Row collection to set AllowMerging to true.It says it is a read-only collection.
Thanks !!!

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Bob Learned

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Éric Moreau

I am using this code to merge cells of a row and set their values:

.AllowMerging = AllowMergingEnum.FixedOnly

' create row headers
.Rows(0).AllowMerging = True

'---------- Create group header (merge some cells) ------------------
' Group 1 merge
Dim rng As CellRange '= .GetCellRange(0, 0, 0, 1)
'rng.Data = "Heading"

rng = .GetCellRange(0, 3, 0, 7)
rng.Data = "Transactions"

' Group 3 merge
rng = .GetCellRange(0, 8, 0, 12)
rng.Data = "Cumulative"

' Group 4 merge
rng = .GetCellRange(0, 13, 0, 17)
rng.Data = "Other Info"