GNUstep GUI design

Hi,

  I just notice that the GNUstep applications tend
  to separate the folder into another window than its content.
  For example, the folder of GNUMail is in a separated window than mails,
  so does the LuserNET.
  Is it a common GUI design for GNUstep applications ?
  Personnaly I prefer the folder is in the same window with its content
  so that I can switch the folder easily,
  not to search where the folder window is first.
  I guess that's the reason why Cocoa add the NSDrawer.
  While I'm working on the MusicBox,
  I'm thinking whether to separate the playlist into
  a window as GNUMail and LuserNET do.
  Any comment ?

  PS. I prefer to discuss in apps-gnustep maillist
  because it is something about application.

  Yen-Ju


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