Based on what you've said, I would not recommend using the
DisplayBrowseExprDialog method at all. The intention of this dialog is to display properties relative to a particular sequence context. Based on what you've said, it sounds like you need an ordinary combo box. You can use the TestStand ExpressionEdit control (set to combo box), or (what I would recommend) simply an ordinary combo box with a list of values. These values can be pulled by using the function DAQmxGetSysDevNames (http://forums.ni.com/ni/board/message?board.id=231&message.id=4175&requireLogin=False). In any case, the objecttobrowse input is expecting a sequence context, which would show how a list of device names is not appropriate for this method.
Thanks,
Andy McRorie
NI R&D