title: NSTextView Text Alignment
body: <p>well, I was searching for the code to make the "Left/Center/Right" Alignment for the NSTextView. I observe that in Text Menu, this functionality exists, and it is linked to the first responder calling the "alignCenter" selector. However I could not make it to work.</p>
  
  <p>So I start to read the source code of TextEdit. It seems that Apple implement it and shows in the toolbar. However I was not able to find where it is. (It's not in any .nib file, and there's no selector related to align or centre or left, etc..)</p>
  
  <p>So can anyone tell me: how to implement the function exactly like that in the Text Menu.</p>
  
  <p>OR</p>
  
  <p>Where the heck did Apple put the source code of aligning the text in their TextEdit program?</p>