DropDownOpened事件
Dim items As String = ""
For Each dr As DataRow In DataTables("表B").datarows
items += dr("数据") & "|"
Next
Dim lsx As WinForm.CheckedListBox = e.Form.Controls("CheckedListBox1")
lsx.ComboList = items.Trim("|")
lsx.Value = e.Form.DropDownBox.text
e.Form.DropDownBox.Select() '将输入焦点返回下拉列表框