Button's Click through problem? Help?

Hello! I am a novice in Unity and scripting. Of course I am having problems with lot of stuff.
In my scene, I put some buildings and three cameras. On first camera I apply script for rotate on mouse drag and rotate on mouse scroll. Second camera auto rotates around the scene and third is First person camera. I use script for switching between cameras on three buttons. That all work very good but when i click on button and drag on it, camera in my scene is draging(rotating) to. I realize that i have click through problem.
I am looking for a solution, reading other questions and answers but no luck for now.

Can someone help me on this please?

If you are using the new 4.6 ui system, then make sure there is an EventSystem in the hierarchy. This is required to perform the internal ray casting to make UI objects intractable. If this is not the case, add a screenshot showing is the editor view with the button in question selected.

Edit: An EventSystem can be made by going to Create > UI > EventSystem.