Ubuntu 13.04 Dash Home does not scale the icons

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Hello to all,
the other day I decided to switch from Ubuntu 12.04 64-bit Ubuntu 13.04, but this latest version of Ubuntu will not let me customize the icons as I did in 12.04.


With 12.04 I entered in the file system with administrator privileges and I went to the following location: "file system -> usr -> share -> applications".
When I arrived here I clicked on the program icon that I wanted to edit ,with the right mouse button, as in the image

http://www.imagehost.it/pm/LHXQ/a.html


Here I chose the image of the icon in svg format and then I went out.
Once I have done this when I came into the dash, the icon was a perfect scale in all the other icons. Same thing for the launcher.


Now instead of Ubuntu 13.04, the problem is in the dash, because the icon is larger than the others (as in the image)


http://www.imagehost.it/pm/BOGK/b.html


I remember that there was this problem in Ubuntu 12.10. So I ask, and I hope that someone knows how to solve this problem.
I trust in your kindness.
Thank you.
Have a nice day ):P