PRB: Numeric Values Shift in Grid Column Containing NULL Values

MORE INFORMATION

Steps to Reproduce Behavior

1. Run the following code from a program (.prg) file:

         PUBLIC OFORM1
         CREA TABLE NULLTEST (F1 N(5,2) NULL)
         FOR LNI = 1 TO 5
            INSERT INTO NULLTEST VALUES (NULL)
         ENDFOR
         USE NULLTEST
   
         OFORM1=CREATEOBJECT("form1")
         OFORM1.SHOW
         RETURN
   
         DEFINE CLASS FORM1 AS FORM
   
            AUTOCENTER = .T.
            HEIGHT = 268
            WIDTH = 378
            CAPTION = "Form1"
            NAME = "Form1"
   
            PROC INIT
               THIS.GRD1.COLUMN1.TEXT1.NULLDISPLAY = "0"
            ENDPROC
   
            ADD OBJECT GRD1 AS GRID WITH ;
               COLUMNCOUNT = 1, ;
               LEFT = 33, ;
               RECORDSOURCE = "nulltest", ;
               RECORDSOURCETYPE = 1, ;
               TOP = 28, ;
               NAME = "grd1", ;
               COLUMN1.SPARSE = .F., ;
               COLUMN1.NAME = "Column1"
         ENDDEFINE
   						

2. Type the number 2 in the grid cell in the first row.
3. Press the DOWN ARROW key. The 0 in the second row shifts left.
4. Press the DOWN ARROW key again. The 0 in the second row shifts right.
5. Press the UP ARROW key twice. The 0 in the second row shifts left again.