After installing Lubuntu 12.10, I decided to install IDLE 3 (from the official Ubuntu repository), but something unexpected happened: its icon gets bigger than the LxPanel and all the another application icons; the same happens on the menu when I select it from Menu > Programming > IDLE 3.
Check the image:
Note: Wasn't possible to take a printscreen from IDLE at the Menu because the printscreen action ignores the menu when it is opened.
Knowing that, I'd like to know how to change the icon of an application? Or better, if possible, how to resize this specific icon to normal size?