How to lock(passcode lock) iPhone programmatically?

For some security reasons, I wanted to lock my iPhone Screen through application. Can anybody tell me how it can be acheived?

I gone through many links & forums, but everyone says that it开发者_JAVA百科 is not possible. But if this is the case, can someone tell me how "Find iPhone" application (which is approved by Apple) can do a apsscode lock through application? Here is link for Find iPhone application: [1]: http://itunes.apple.com/us/app/find-my-iphone/id376101648?mt=8

At least, I wanted to know the logic behind it..

"Find My iPhone" is not just approved by Apple, it is by Apple. Chances are it uses undocumented security features that are not available for us to use.