你可以在DropDownOpening事件设置代码:
http://www.foxtable.com/webhelp/scr/2114.htm
代码大概如下:
if e.dropdownBox.Text > "" then
Dim lst As New List(of String)
lst.Addrange(e.DropDownBox.Text.split(","))
For each r as Row in Tables("表名").Rows
r.Checked = lst.Contains(r("附件"))
Next
end if