Thank you Nisha. This line did the trick for me in my SaveCellFormattedText event.
Me.DataView1(row - 1)(col) = DBNull.Value
If anyone is interested in the whole sub:
Dim col As Integer = CType(sender, GridModel).CurrentCellInfo.ColIndex
Dim row As Integer = CType(sender, GridModel).CurrentCellInfo.RowIndex
If row > 0 And col > 0 Then
If e.Text = "" Then
Me.DataView1(row - 1)(col) = DBNull.Value
Else
Me.DataView1(row - 1)(col) = e.Text
End If
End If