Expand scenario data.

If Mappable Data is expanded using the icon to its left, behavior is normal (expand or collapse list).

If Mappable Data is double-clicked, it will expand or collapse, but it also pops up a box with a "Choose Map Name" header, and with text "Select a name for the new map" and a text box with "Map 2" showing up by default. Box button options are OK and Cancel. Clicking Cancel simply closes the box.

Minor issue. Please be aware, though.