Goto new (now new vi) and select template then Dialog using events (very flexable but requires more labview know-how) or dialog. This will start a dialog vi for you, drop your dropdown list, and wire the control to an indicator version to wire as the output. Move the indicator offscreen or hide it. You will be left with a dialog with a dorpdown list to select from, work from that and build up the required features. Sorry I am not a fan of using the express vis I use the manual approach, that way the vi will scate to my needs.