I got around this mindset along the years, by learning about the importance of lowering the maintenance costs, improving collaboration and not depending on any single person to understand any given module or system.

Books such as "Code Complete"[1] and "Clean Code"[2] should help you with that transition.

[1] http://www.amazon.com/Code-Complete-Practical-Handbook-Const...

[2] http://www.amazon.com/Clean-Code-Handbook-Software-Craftsman...