Tiles can be purchased, although a bug causes selecting the wrong tile.
Clicking once logs what tile you clicked.
Clicking again _without moving the mouse from the first click_ opens a confirmation window to purchase the tile. If the user clicks yes, a function is called that does nothing, onConfirmBuyTile, that needs to be implemented.
Currently the getTileFromPx function in the map is returning not-quite the correct values for this specific usage. I'm working on that.