Hello,

I have been looking into your question, however, by default the approach with defining Fields, TextFields, etc. and set their name property works if the field corresponds to a specific property of the underlying data.
In your scenario instead of defining field layout, I can suggest two approaches:

1. Set the AutoGenerateFields property to true and in the grid's  FieldLayoutInitialized event handler gets the field and set its Label per your requirement:

 private void XamDataGrid_FieldLayoutInitialized(object sender, Infragistics.Windows.DataPresenter.Events.FieldLayoutInitializedEventArgs e)
        {
            e.FieldLayout.Fields["Value"].Label = "My Label";
        }

2. Instead of TextField define it as UndoundField:

<igDP:XamDataGrid DataSource="{Binding Mode=OneWay}">
            <igDP:XamDataGrid.FieldLayoutSettings>
                <igDP:FieldLayoutSettings AutoGenerateFields="False"/>
            </igDP:XamDataGrid.FieldLayoutSettings>
            <igDP:XamDataGrid.FieldLayouts>
                <igDP:FieldLayout>
                    <igDP:UnboundField BindingPath="." Name="Value" Label="My Label"/>
                </igDP:FieldLayout>
            </igDP:XamDataGrid.FieldLayouts>
        </igDP:XamDataGrid>

I have attached a sample application, that uses the second approach, however, as a comment, you could find the first as well. Please test it on your side and let me know if I may be of any further assistance.

Sincerely,
Teodosia Hristodorova
Associate Software Developer

7356.XDG_to_List.zip