dev GridControl winform 合并单元格问题
求助：我想合并gridcontrol中某行的几列单元格，设置了AllowCellMerge之后是垂直合并的，有没有高手知道怎么做呀？

'Dim _Helper As New MyCellMergeHelper(GridView1)
'_Helper.AddMergedCell(1, 0, 1, "MyMergedCell1")

Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Columns
Imports System.Windows.Forms

Public Class MyCellMergeHelper

    Public Sub New(ByVal view As GridView)
        _view = view
        AddHandler view.CustomDrawCell, AddressOf view_CustomDrawCell
        AddHandler view.GridControl.Paint, AddressOf GridControl_Paint
        AddHandler view.CellValueChanged, AddressOf view_CellValueChanged
        painter = New MyGridPainter(view)
    End Sub

    Private painter As MyGridPainter
    Private _view As GridView
    Private _MergedCells As New List(Of MyMergedCell)()

    Public ReadOnly Property MergedCells() As List(Of MyMergedCell)
        Get
            Return _MergedCells
        End Get
    End Property

    Public Function AddMergedCell(ByVal rowHandle As Integer, ByVal col1 As GridColumn, ByVal col2 As GridColumn) As MyMergedCell
        Dim cell As New MyMergedCell(rowHandle, col1, col2)
        _MergedCells.Add(cell)
        Return cell
    End Function

    Public Sub AddMergedCell(ByVal rowHandle As Integer, ByVal col1 As Integer, ByVal col2 As Integer, ByVal value As Object)
        AddMergedCell(rowHandle, _view.Columns(col1), _view.Columns(col2), value)
    End Sub

    Public Sub AddMergedCell(ByVal rowHandle As Integer, ByVal col1 As GridColumn, ByVal col2 As GridColumn, ByVal value As Object)
        Dim cell As MyMergedCell = AddMergedCell(rowHandle, col1, col2)
        SafeSetMergedCellValue(cell, value)
    End Sub

    Public Sub SafeSetMergedCellValue(ByVal cell As MyMergedCell, ByVal value As Object)
        If cell IsNot Nothing Then
            SafeSetCellValue(cell.RowHandle, cell.Column1, value)
            SafeSetCellValue(cell.RowHandle, cell.Column2, value)
        End If
    End Sub

    Public Sub SafeSetCellValue(ByVal rowHandle As Integer, ByVal column As GridColumn, ByVal value As Object)
        If _view.GetRowCellValue(rowHandle, column) IsNot value Then
            _view.SetRowCellValue(rowHandle, column, value)
        End If
    End Sub

    Private Function GetMergedCell(ByVal rowHandle As Integer, ByVal column As GridColumn) As MyMergedCell
        For Each cell As MyMergedCell In _MergedCells
            If cell.RowHandle = rowHandle AndAlso (column Is cell.Column1 OrElse column Is cell.Column2) Then 
 
                Return cell
            End If
        Next cell
        Return Nothing
    End Function

    Private Function IsMergedCell(ByVal rowHandle As Integer, ByVal column As GridColumn) As Boolean
        Return GetMergedCell(rowHandle, column) IsNot Nothing
    End Function

    Private Sub DrawMergedCells(ByVal e As PaintEventArgs)
        For Each cell As MyMergedCell In _MergedCells
            painter.DrawMergedCell(cell, e)
        Next cell
    End Sub

    Private Sub view_CellValueChanged(ByVal sender As Object, ByVal e As CellValueChangedEventArgs)
        SafeSetMergedCellValue(GetMergedCell(e.RowHandle, e.Column), e.Value)
    End Sub

    Private Sub GridControl_Paint(ByVal sender As Object, ByVal e As PaintEventArgs)
        DrawMergedCells(e)
    End Sub

    Private Sub view_CustomDrawCell(ByVal sender As Object, ByVal e As RowCellCustomDrawEventArgs)
        If IsMergedCell(e.RowHandle, e.Column) Then
            e.Handled = Not painter.IsCustomPainting
        End If
    End Sub

End Class