Hello Erika Bumatay,

I have investigated your issue that you need to implement conditional editing on a template column whose editor template is a combbox.

As to how to use a combo box in an editor template, it is explained in the following online help document.
https://es.infragistics.com/help/wpf/xamgrid-using-editing-events-to-create-a-custom-editor

And regarding conditional editing, use CellEnteringEditMode event and cancel the event.

private void xamGrid1_CellEnteringEditMode(object sender, Infragistics.Controls.Grids.BeginEditingCellEventArgs e)
{
    if(e.Cell.Column.Key == "<column_key>")
    {
        if(e.Cell.Value.ToString() == "A")
        {
            e.Cancel = true;
        }
    }
}

I hope this will help you.

Best Regards,

Noriko I.
Developer Support Engineer
Infragistics, Inc.