       payload    : 'system-message' : 'stop'
       channelId  : @socialChannel.id
     , callback
+
+    @rtm.deleteFile @getRealTimeFileName()
+
+    @rtm.once 'FileDeleted', =>
+      log 'file deleted'

    { channelId } = @workspaceData

    if channelId
      @isRealtimeSessionActive channelId, (isActive) =>

        return @continuePrivateMessage callback  if isActive

        @statusBar.share.show()
        log 'start collaboration'

    else
      @initPrivateMessage callback

      channelId  : @socialChannel.id
    , callback

    @rtm.once 'FileCreated', (file) =>
      log 'file created', file
      @chat.emit 'CollaborationStarted'

    @rtm.createFile @getRealTimeFileName()


  stopCollaborationSession: (callback) ->

