I just studying how to build up a grid by custom class,my codes as following...

MYFORM.MYGRID.ADDOBJECT("COL","MYCOLUMN")

DEFINE CLASS MYCOLUMN AS COLUMN
CONTROLSOURCE="ALIAS.FIELDNAME"
WIDTH=90
VISIBLE = .T.
ADD OBJECT HEADER1 AS MYHEADER
ENDDEFINE

DEFINE CLASS MYHEADER AS HEADER
CAPTION="Quotation NO"
PROCEDURE CLICK
WAIT "CLICKED" WINDOW NOWAIT
ENDPROC
ENDDEFINE

But I don't known only one record was visible at a time.

When I uses AddCOLOUMN method,all records are visible.

Pls kindly advise.