I never really had a problem with this. Here is how I do it so you can try it as well:

select MyCursor
go top

thisform.GRD.recordsource = 'MyCursor'

thisform.GRD.COLUMN1.controlsource = 'MyCursor.column1'
thisform.GRD.COLUMN2.controlsource = 'MyCursor.column2'

keep going like so for all of the columns....

thisform.GRD.refresh()

Give it a try.....