How can I clear a filter I have set programmatically to a data environment? I use, for example,

thisform.dataenvironment.cursor1.Filter = 'State = "CO"'

to set a filter on the cursor. If I issue either

thisform.dataenvironment.cursor1.Filter = ''
or
thisform.dataenvironment.cursor1.Filter

both give me an error. I am looking for the new equivalent of SET FILTER TO.

Thanks so much.