Scrollable popup list is something you have to do yourself. Create a panel, set up how it should be with the draggable panel scripts, scroll bar, etc, add a UIGrid to it with 1 column. Save it as a prefab. Create a child of the UIGrid, make it look like you need it to be, add a collider / UIDragPanelContents to it, and save it as a prefab as well.
When it's time to display your popup, instantiate your panel and add children to its grid object for each country.
