Brush Replace - Map Editor Shortcut?

[Derlexy]

Hello guys, i need little help.

I know as a fact that there is a keyboard keys combination to replace items on RME, but i do not remember it =(
Example: i have a cave with some walls and i want to replace all the walls of that cave with my own wall that i've created. I cant just replace by the replacement tool cuz it will replace all over the map. I just want to replace at this cave...

 

[Niloahs]

select all the area and use "replace item on selection"