title: "Add Required Plug-ins" button in Eclipse RCP product configuration?
body: <p>I don't quite understand what plug-ins constitue the list Dependencies when I make a product configuration in Eclipse RCP and what does the button "Add Required Plug-ins" exactly do? Why the Dependencies list is not full from the very beginning and why I have to use that button?</p>
  
  <p>Thank you.</p>