iOS - Add "object's" to existing app (jailbroken)
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How do you add "object's" to an existing app ?

For example, the [EasyRefresh for Chrome][1] tweak, enables a new button inside the iOS Chrome app, As do many other different tweaks.

How may i add a simple `UIButton` to for example, the Twitter app ?

Is there any [GitHub][2] project's that might help me getting me to understand how it's done ?


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![image][3] 

Image Source: [ModMyI][3]

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Thanks.


  [1]: http://modmyi.com/content/8131-easily-refresh-pages-google-chrome-easyrefresh-chrome.html
  [2]: https://github.com/
  [3]: http://modmyi.com/images/anthony/easyrefreshch.png