Unity 5 Reisizing problem

I tried to resize terrain using normal tool,but it just change tool and start moving terrain down or up. Can someone help?

Here is few screenshots:

You cannot reisize terrains using the scale tool. If you want to change size of a terrain go to the terrain settings tab of the terrain component. (Click the gear icon on the terrain component to get there). And change the terrain width and height under the resolution section.