thisform.grid1.addcolumn
thisform.grid1.column2.controlsource="aa.a"
thisform.grid1.column2.addobject('sb','combobox')
thisform.grid1.column2.currentcontrol='sb'
thisform.grid1.column2.sparse=.F.
thisform.grid1.column2.sb.visible=.t.
thisform.grid1.column2.sb.rowsourcetype=2
thisform.grid1.column2.sb.rowsource='bb'
thisform.grid1.column2.sb.boundcolumn=1