How can the grid auto adjust column widths so that the columns completely fill the grid's client area in WinForms GridControl or GridDataBoundGrid?

private void grid_QueryColWidth(object sender, GridRowColSizeEventArgs e)
{
   switch(_colSizeBehavior)
   {
       case GridColSizeBehavior.FillRightColumn:
     if(e.Index == this.grid.Model.ColCount)
     {
        e.Size = this.grid.ClientSize.Width - this.grid.Model.ColWidths.GetTotal(0, this.grid.Model.ColCount - 1);
        e.Handled = true;
     }
     break;
       case GridColSizeBehavior.FillLeftColumn:
     if(e.Index == this.grid.Model.Cols.FrozenCount + 1)
     {
        int leftPiece = this.grid.Model.ColWidths.GetTotal(0, this.grid.Model.Cols.FrozenCount);
        int rightPiece = this.grid.Model.ColWidths.GetTotal(this.grid.Model.Cols.FrozenCount + 2, this.grid.Model.ColCount);
        e.Size = this.grid.ClientSize.Width - leftPiece - rightPiece;
        e.Handled = true;
     }
     break;
       case GridColSizeBehavior.EqualProportional:
     if(e.Index == this.grid.Model.ColCount)
     {
        e.Size = this.grid.ClientSize.Width - this.grid.Model.ColWidths.GetTotal(0, this.grid.Model.ColCount - 1);
     }
     else
     {
        e.Size = (int) (this.colRatios[e.Index] * this.grid.ClientSize.Width);
     }
     e.Handled = true;
     break;
       default:
     break;
    }
}

Private Sub grid_QueryColWidth(ByVal sender As Object, ByVal e As GridRowColSizeEventArgs)
    Select Case _colSizeBehavior
        Case GridColSizeBehavior.FillRightColumn
       If e.Index = Me.grid.Model.ColCount Then
          e.Size = Me.grid.ClientSize.Width - Me.grid.Model.ColWidths.GetTotal(0, Me.grid.Model.ColCount - 1)
          e.Handled = True
       End If
        Case GridColSizeBehavior.FillLeftColumn
       If e.Index = Me.grid.Model.Cols.FrozenCount + 1 Then
          Dim leftPiece As Integer = Me.grid.Model.ColWidths.GetTotal(0, Me.grid.Model.Cols.FrozenCount)
          Dim rightPiece As Integer = Me.grid.Model.ColWidths.GetTotal(Me.grid.Model.Cols.FrozenCount + 2, Me.grid.Model.ColCount)
           e.Size = Me.grid.ClientSize.Width - leftPiece - rightPiece
          e.Handled = True
       End If
                 If e.Index = Me.grid.Model.ColCount Then
                    e.Size = Me.grid.ClientSize.Width - Me.grid.Model.ColWidths.GetTotal(0, Me.grid.Model.ColCount - 1)
                 Else
                    e.Size = CInt(Fix(Me.colRatios(e.Index) * Me.grid.ClientSize.Width))
                 End If
                 e.Handled = True
        Case Else
    End Select
End Sub