Rpg Maker Vx ace tileset question

[evmaster]

So when making a map you can place down tile and things. Well, now and then I place down something I don't want. An I don't know how to cut or get rid of what I just place down. In the old rpg maker they had a tile you could select I believe that could go over the tile you just place down and make it a default transparent tile again. This would be very helpful to know as I don't want to keep deleting my maps in order to redo them for tiles I want to replace. Anyone know what I am talking about?