diff --git a/.gitignore b/.gitignore
index 5c08234..2106628 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 target
 env/
 __pycache__
-main.spec
\ No newline at end of file
+main.spec
+*.afdesign
\ No newline at end of file
diff --git a/file_handler.py b/file_handler.py
index 56eafb3..40fd74a 100644
--- a/file_handler.py
+++ b/file_handler.py
@@ -14,7 +14,8 @@ class ItemDescriptor():
         self.definition = definition
         self.value = value
         self.entity_type = entity_type
-        
+
+
 class NodeType(Enum):
      Root = "root"
      Section = "section"
@@ -28,7 +29,7 @@ class NodeType(Enum):
      MultiTag = "multi_tag"
      Group = "group"
      Feature="feature"
-     
+
 
 class Singleton(type):
     _instances = {}
@@ -37,6 +38,7 @@ class Singleton(type):
             cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
         return cls._instances[cls]
 
+
 class FileHandler(metaclass=Singleton):
     
     def __init__(self) -> None:
@@ -70,12 +72,11 @@ class FileHandler(metaclass=Singleton):
             self._nix_file.close()
             self._nix_file = None
             self._file_requests = []
-    
+
     def file_descriptor(self):
         
         return ItemDescriptor()
-    
-   
+
     @property
     def is_valid(self):
         return self._nix_file is not None and self._nix_file.is_open()
@@ -83,7 +84,7 @@ class FileHandler(metaclass=Singleton):
     @property
     def filename(self):
         return self._filename
-    
+
     def request_metadata(self, root_id=None, depth=1):
         """[summary]
 
@@ -122,10 +123,10 @@ class FileHandler(metaclass=Singleton):
             infos.append(itd)
             # TODO set the value to something meaningful for the various entity types
         return infos
-        
+
     def request_blocks(self):
         return self._entity_info(self._nix_file.blocks, None, NodeType.Block)
-        
+
     def request_data_arrays(self, block_id):
         return self._entity_info(self._nix_file.blocks[block_id].data_arrays, block_id, NodeType.DataArray)
 
@@ -133,7 +134,7 @@ class FileHandler(metaclass=Singleton):
         tags = self._entity_info(self._nix_file.blocks[block_id].tags, block_id, NodeType.Tag)
         tags.extend(self._entity_info(self._nix_file.blocks[block_id].multi_tags, block_id, NodeType.MultiTag))
         return tags
-    
+
     def request_references(self, block_id, tag_id, is_mtag):
         b = self._nix_file.blocks[block_id]
         t = None
@@ -155,7 +156,7 @@ class FileHandler(metaclass=Singleton):
             itd = ItemDescriptor(f.data.name, f.id, f.link_type, definition=f.data.definition, block_id=block_id, entity_type=NodeType.Feature)
             feats.append(itd)
         return feats
-    
+
     def request_dimensions(self, block_id, array_id):
         dimensions = []
         for i, d in enumerate(self._nix_file.blocks[block_id].data_arrays[array_id].dimensions):
@@ -163,12 +164,12 @@ class FileHandler(metaclass=Singleton):
             dim_type= "%s %s" % (d.dimension_type, "dimension")
             dimensions.append(ItemDescriptor(dim_name, type=dim_type, entity_type=NodeType.Dimension, block_id=block_id))
         return dimensions
-    
+
     def request_data_frames(self, block_id):
         if self._nix_file.version[1] >= 2:
             return self._entity_info(self._nix_file.blocks[block_id].data_frames, block_id, NodeType.DataFrame)
         return []
-    
+
     def request_groups(self, block_id):
         return self._entity_info(self._nix_file.blocks[block_id].groups, block_id, NodeType.Group)
 
diff --git a/tree_model.py b/tree_model.py
index f2818b8..d46c1d8 100644
--- a/tree_model.py
+++ b/tree_model.py
@@ -1,9 +1,8 @@
-from PyQt5.QtCore import QAbstractItemModel, QFile, QModelIndex, QSize, Qt
+from PyQt5.QtCore import QAbstractItemModel, QModelIndex, Qt
 from PyQt5.QtGui import QIcon
-from PyQt5.QtWidgets import QHeaderView, QTreeWidgetItem
+from PyQt5.QtWidgets import QTreeWidgetItem
 
 from file_handler import ItemDescriptor, NodeType
-from IPython import embed
 
 column_names = ['Name', 'Type', 'ID', 'Value', 'Description']
 
@@ -56,7 +55,7 @@ class NixTreeItem(QTreeWidgetItem):
             return self._parent_item._child_items.index(self)
         return 0
 
-    
+
 class FileTreeItem(NixTreeItem):
     def __init__(self, node_descriptor, file_handler, parent=None):
         super().__init__(node_descriptor, file_handler=file_handler, parent=parent)