old_contents: 
  """
  plugin DataLoader responsible of loading data
  """
  
  from sans.guiframe.plugin_base import PluginBase
  
  class Plugin(PluginBase):
      
      def __init__(self, standalone=False):
          PluginBase.__init__(self, name="DataLaoder", standalone=standalone)
          
      def populate_file_menu(self):
          """
          get a menu item and append it under file menu of the application
          add load file menu item and load folder item
          """
          hint_load_folder = "Read file(s) from a folder and load"
          hint_load_folder += " them into the application"
          hint_load_file = "Read files and load them into the application"
          return [["Load File", hint_load_file, self._load_file],
                  ["Load Folder", hint_load_folder ,self._load_file]]
    
      def _load_file(self, event):
          """
          Load file(s)
          """
      def _load_folder(self, event):
          """
          Load entire folder
          """
new_contents: 
  """
  plugin DataLoader responsible of loading data
  """
  
  from sans.guiframe.plugin_base import PluginBase
  
  class Plugin(PluginBase):
      
      def __init__(self, standalone=False):
          PluginBase.__init__(self, name="DataLaoder", standalone=standalone)
          
      def populate_file_menu(self):
          """
          get a menu item and append it under file menu of the application
          add load file menu item and load folder item
          """
          hint_load_folder = "Read file(s) from a folder and load"
          hint_load_folder += " them into the application"
          hint_load_file = "Read files and load them into the application"
          
          return [["Load File", hint_load_file, self.parent._on_open],
                   #["Load File", hint_load_file, self._load_file],
                  ["Load Folder", hint_load_folder ,self._load_folder]]
    
      def _load_file(self, event):
          """
          Load file(s)
          """
      def _load_folder(self, event):
          """
          Load entire folder
          """
          
subject: add loading back