private void mBOM50206UG_InitializeRow(object sender, Infragistics.Win.UltraWinGrid.InitializeRowEventArgs e)
        {
            //Create the Settings Object:
            DefaultEditorOwnerSettings theSettings = new DefaultEditorOwnerSettings();

            //as well as the Editor Owner:
            DefaultEditorOwner theOwner = new DefaultEditorOwner(theSettings);

            EmbeddableEditorBase theEditor = null;

            object theValue = e.Row.Cells["QTYToTransfer"].Value;

            //Create an appropriate editor based on the
            //Value's Data Type:
            if (theValue is decimal)
            {
                theSettings.DataType = typeof(decimal);
                //theSettings.Format = "n2";
                theSettings.MaskInput = "nnn,nnn,nnn,nnn.nnnnn";
                theEditor = new EditorWithMask(theOwner);
               
            }

            //Assign it to the Cell.Editor
            e.Row.Cells["QTYToTransfer"].Editor = theEditor;

I'm not sure why it's not working for you, but the code you posted here is unreadable. Can you post it again and surround it with a 'code' tag? Or copy the code into notepad and then copy and paste it from there, so it doesn't get formatted.