diff --git a/fluents/selections.py b/fluents/selections.py
index 8f0470e..a1ea856 100644
--- a/fluents/selections.py
+++ b/fluents/selections.py
@@ -141,6 +141,26 @@ class IdListController:
 
             self._menu_ann.set_submenu(annotations_menu)
 
+    def import_annotation_file(self):
+        """Pops up a file dialog and ask the user to select the annotation
+        file to be loaded. Only one file can be selected. The file is loaded
+        into a annotations.AnnotationDictHandler object"""
+
+        dialog = gtk.FileChooserDialog('Load annotations')
+        dialog.set_action(gtk.FILE_CHOOSER_ACTION_OPEN)
+        dialog.add_buttons(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, 
+                           gtk.STOCK_OPEN, gtk.RESPONSE_OK)
+        dialog.set_select_multiple(True)
+        retval = dialog.run()
+        if retval in [gtk.RESPONSE_CANCEL, gtk.RESPONSE_DELETE_EVENT]:
+            pass
+        elif retval == gtk.RESPONSE_OK:
+            for filename in dialog.get_filenames():
+                annotations.read_annotations_file(filename)
+        else:
+            print "unknown; ", retval 
+        dialog.destroy()
+
     ##
     ## GTK Callbacks
     ##
@@ -160,21 +180,8 @@ class IdListController:
         print "export stuff"
 
     def _on_import_list(self, menuitem):
-        dialog = gtk.FileChooserDialog('Load annotations')
-        dialog.set_action(gtk.FILE_CHOOSER_ACTION_OPEN)
-        dialog.add_buttons(gtk.STOCK_CANCEL, gtk.RESPONSE_CANCEL, 
-                           gtk.STOCK_OPEN, gtk.RESPONSE_OK)
-        dialog.set_select_multiple(True)
-        retval = dialog.run()
-        if retval in [gtk.RESPONSE_CANCEL, gtk.RESPONSE_DELETE_EVENT]:
-            pass
-        elif retval == gtk.RESPONSE_OK:
-            for filename in dialog.get_filenames():
-                annotations.read_annotations_file(filename)
-        else:
-            print "unknown; ", retval 
-        dialog.destroy()
-
+        self.import_annotation_file()
+        
 
 class SelectionListController:
     def __init__(self, seltree, idlist_controller):
@@ -207,23 +214,29 @@ class SelectionListController:
 
         # Selections context menu
         self._seltree_menu = SimpleMenu()
-        self._seltree_menu.add_simple_item('Sort by selection', self._on_seltree_sort)
-        self._seltree_menu.add_simple_item('Show details', self._enable_details, True)
-        self._seltree_menu.add_simple_item('Hide details', self._enable_details, False)
-        # self._seltree_menu.add_simple_item('Copy selection', self._on_seltree_copy_selection)
+        self._seltree_menu.add_simple_item('Sort by selection', 
+                                           self._on_seltree_sort)
+        self._seltree_menu.add_simple_item('Show details',
+                                           self._enable_details, True)
+        self._seltree_menu.add_simple_item('Hide details', 
+                                           self._enable_details, False)
+
     #
     # Public interface
     #
-
     def set_project(self, project):
         """Dependency injection."""
         self.project = project
         project.add_selection_observer(self)
         
     def set_dimlist_controller(self, dimlist_controller):
+        """Dependency injection of the dimension list controller."""
         self._dimlist_controller = dimlist_controller
 
     def set_dimension(self, dim):
+        """Set the current dimension, changing the model of the treeview
+        to match dim. After this the current dimension of the identifier list
+        is updated."""
         self._ensure_selection_store(dim)
         self._seltree.set_model(self._sel_stores[dim])
         self._idlist_controller.set_dimension(dim)
@@ -246,6 +259,10 @@ class SelectionListController:
                         row[3] = row[4] = len(selection[dim])
 
     def add_dataset(self, dataset):
+        """Converts a CategoryDataset to Selection objects and adds it to
+        the selection tree. The name of the dataset will be the parent 
+        node in the tree, and the identifers along the first axis will
+        be added as the names of the subselections."""
         dim_name = dataset.get_dim_name(0)
         self._ensure_selection_store(dim_name)
         store = self._sel_stores[dim_name]
@@ -402,6 +419,7 @@ class SelectionListController:
         if isinstance(obj, dataset.CategoryDataset):
             self._sort_selections(obj)
 
+
 class DimListController:
     def __init__(self, dimlist, seltree_controller):
         
@@ -458,6 +476,7 @@ class DimListController:
         return None
 
     def set_dimension(self, dimname):
+        """Sets the current dimension."""
         self._current_dim = dimname
         
         dim = self.get_dimension(self._current_dim)
@@ -481,24 +500,27 @@ class DimListController:
     # Private interface
     #
     def _dimension_filter(self, store, row):
-        """Filters out dimension with underscore prefix"""
+        """Filters out dimensions with underscore prefix."""
         visible = False
         name = store.get_value(row, 0)
         if name != None:
             visible = name[0]!="_"
-        #print (name, visible)
         return visible
 
+    #
+    # GTK Callbacks.
+    #
     def _on_dim_hide(self, menuitem):
+        """Menu item callback function which hides underscore prefixed
+        dimensions."""
         self.dimstore_filter.refilter()
         self.dimlist.set_model(self.dimstore_filter)
 
     def _on_dim_show(self, menuitem):
+        """Menu item callback function that shows underscore prefixed
+        dimension names."""
         self.dimlist.set_model(self.dimstore)
     
-    #
-    # GTK Callbacks.
-    #
     def _dim_cursor_changed(self, widget):
         cursor = self.dimlist.get_cursor()[0]
         i = self.dimlist.get_model().get_iter(cursor)
@@ -511,3 +533,4 @@ class DimListController:
     def _dimlist_button_pressed(self, widget, event):
         if event.button == 3:
             self._dimlist_menu.popup(None, None, None, event.button, event.time)
+