title: How to enable design mode in flashbuilder
body: <p>I am trying to enable the design mode on my trial flashbuilder but could not find any option to do so, </p>
  
  <p>I have checked out Windows menu but there is no enable design mode, 
  and Preferences but there is no Flex in preferences dialog to enable its design mode.</p>
  
  <p><img src="https://i.stack.imgur.com/vlbB8.png" alt="enter image description here"></p>