title: Import existing java project in eclipse but design view not exist for JFrame?
body: <p>I import  existing java project in eclipse:<br>
  in eclipse:<br>
  1. go to <strong>File</strong> -> <strong>Import</strong><br>
  2. <strong>General</strong> -> <strong>Existing Projects into Workspace</strong> and click <strong>Next</strong>  </p>
  
  <p><img src="https://i.stack.imgur.com/j1fYy.png" alt="enter image description here">  </p>
  
  <p>3.click on <strong>Browse</strong> and select project then click on <strong>Finish</strong>  </p>
  
  <p><img src="https://i.stack.imgur.com/2L0xG.png" alt="enter image description here">  </p>
  
  <p>then i open a JFrame , but i see source code of JFrame and design tab not exist.  </p>
  
  <p><img src="https://i.stack.imgur.com/dgYEo.png" alt="enter image description here">  </p>
  
  <p>how to view Design tab?</p>