When we redefine the grid's recrdsource,then it's coulmn-controlsource will disappear,so you can try the process:

WITH THISFORM.GD_MYGRID
DECLARE GRIDARR[.COLUMNCOUNT]
FOR II=1 TO .COLUMNCOUNT
GRIDARR[II]=.COLUMNS[II].CONTROLSOURCE
NEXT II
.RECORDSOURCE=''

*****HERE IS THE PROCESS TO CHANGE NEW DATA FOR MY TABLE(TABLENAME)

.RECORDSOURCE='TABLENAME'
FOR II=1 TO .COLUMNCOUNT
.COLUMNS[II].CONTROLSOURCE=GRIDARR[II]
NEXT II

ENDWITH