[SOLVED] Visual Terrain Editor is not working

[kadir.basol]

Hello , i'm new on Unigine.

I've added terrain to my scene by importing heightmap but when i try to use terrain editor to change heights.

Its not effecting the terrain although i click on mouse , why?

 

here is the screenshot:

http://imageshack.us/f/833/height.png/

[manguste]

You need to hold ALT to modify the terrain.