This example checks the database to see if it has any memo fields; if not, row resizing is disabled.
Sub CheckForMemoField()
Dim Fld As Field
DataGrid1.AllowRowSizing = False
For Each Fld in Data1.Recordset.Fields
If Fld.Type = dbMemo Then
DataGrid1.AllowRowSizing = True
DataGrid1.RowHeight = DataGrid1.RowHeight * 2
Exit For
End If
Next
End Sub