title: No "show" in the segue action list in Xcode 6.1
body: <p>I'm new to swift and IOS development. </p>
  
  <p>system information: Xcode 6.1 Release Notes
                      OS X 10.10.1</p>
  
  <p>My app has two view controllers, ViewA and ViewB, (No navigation controller), and I want to jump to ViewB from ViewA by click a UIButton in ViewA. The ViewA has been set as the initial view controller in the App. </p>
  
  <p>By following some online instruction, I pressed ctrl and and drag the UIButton in ViewA to point to ViewB in the storyboard window. However, I got only a incomplete segue list (has only 4 item in total) as the following, in which I couldn't see the "show" item. </p>
  
  #
  
  <p>Action Segue
  push
  modal 
  custom</p>
  
  #
  
  <p>It might looks like that in the old versions, but it is do in Xcode 6.1. </p>
  
  <p>I saw some screen copies of the menu from the other people, they have much more items in their action segue list. Since no "show" available in my segue acton list, I used the "custom" item. It also helped me to jump to ViewB, but I got the following warning in compiling. </p>
  
  <p>"Custom segues must have a custom class"
  "Unsupported Configuration Custom segues must have a customer class"</p>
  
  <p>My questions are: 
  1) How can I access the build-in "show" time in the segue action list? 
  2) Since everything works fine by so far, is there any to get ride of the warning message directly? </p>
  
  <p>Please don't be hesitate the let me know if you require more information to identify the issues. </p>
  
  <p>Since I'm new in iOS development, my questions might be kind of silly, but I do need your help.<br>
  I appreciate your effects with my questions. </p>