Gets the handle of the row which contains the first of two cells that are to be merged.
NuGet Package: DevExpress.Win.Grid
An integer representing the handle of the row that contains the first cell.
The second cell is identified by the CellMergeEventArgs.RowHandle2 property. The column that displays the cell is specified by the CellMergeEventArgs.Column property.
For more information on row handles, refer to the Rows topic.