diff --git a/CHANGELOG.md b/CHANGELOG.md
index f14d0c40..b159970b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+* `utils.Tree`: v0.1.1 broke compatibility with Python 2. Therefore, modified code to be compatible
+  with Python 2. Added `props` and `edge_props` properties to accept arguments passed directly to
+  the node's and edge's dictionaries, respectively (e.g., 'classes', 'positions', etc.).
+* Removed `Tree`'s method `add_child`, because it is redundant with `add_children` called with an
+  argument of length 1.
+
 ## [0.1.1] - 2019-04-05
 
 ### Fixed
diff --git a/README.md b/README.md
index 5bb6273c..860aa5ff 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # Dash Cytoscape [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/plotly/dash-cytoscape/blob/master/LICENSE) [![PyPi Version](https://img.shields.io/pypi/v/dash-cytoscape.svg)](https://pypi.org/project/dash-cytoscape/)
+[![CircleCI](https://circleci.com/gh/plotly/dash-cytoscape.svg?style=svg)](https://circleci.com/gh/plotly/dash-cytoscape)
 
 A Dash component library for creating interactive and customizable networks in Python, wrapped around [Cytoscape.js](http://js.cytoscape.org/).
 
diff --git a/dash_cytoscape/utils/Tree.py b/dash_cytoscape/utils/Tree.py
index 5af0e0c2..618010e7 100644
--- a/dash_cytoscape/utils/Tree.py
+++ b/dash_cytoscape/utils/Tree.py
@@ -2,26 +2,41 @@
 
 
 class Tree(object):
-    def __init__(self, node_id, children=None, data=None, edge_data=None):
+    def __init__(self,
+                 node_id,
+                 children=None,
+                 data=None,
+                 props=None,
+                 edge_data=None,
+                 edge_props=None):
         """
         A class to facilitate tree manipulation in Cytoscape.
         :param node_id: The ID of this tree, passed to the node data dict
         :param children: The children of this tree, also Tree objects
         :param data: Dictionary passed to this tree's node data dict
+        :param props: Dictionary passed to this tree's node dict, containing the node's props
         :param edge_data: Dictionary passed to the data dict of the edge connecting this tree to its
         parent
+        :param edge_props: Dictionary passed to the dict of the edge connecting this tree to its
+        parent
         """
-        if not children:
+        if children is None:
             children = []
-        if not data:
+        if data is None:
             data = {}
-        if not edge_data:
+        if props is None:
+            props = {}
+        if edge_data is None:
             edge_data = {}
+        if edge_props is None:
+            edge_props = {}
 
         self.node_id = node_id
         self.children = children
         self.data = data
+        self.props = props
         self.edge_data = edge_data
+        self.edge_props = edge_props
         self.index = {}
 
     def _dfs(self, search_id):
@@ -58,17 +73,10 @@ def is_leaf(self):
         """
         return not self.children
 
-    def add_child(self, child):
-        """
-        Add a single child to the children of a Tree.
-        :param child: Tree object
-        """
-        self.children.append(child)
-
     def add_children(self, children):
         """
-        Add a list of children to the current children of a Tree.
-        :param children: List of Tree objects
+        Add one or more children to the current children of a Tree.
+        :param children: List of Tree objects (one object or more)
         """
         self.children.extend(children)
 
@@ -77,16 +85,18 @@ def get_edges(self):
         Get all the edges of the tree in Cytoscape JSON format.
         :return: List of dictionaries, each specifying an edge
         """
-        edges = [
-            {
+        edges = []
+
+        for child in self.children:
+            di = {
                 'data': {
                     'source': self.node_id,
-                    'target': child.node_id,
-                    **self.edge_data
+                    'target': child.node_id
                 }
             }
-            for child in self.children
-        ]
+            di['data'].update(child.edge_data)
+            di.update(child.edge_props)
+            edges.append(di)
 
         for child in self.children:
             edges.extend(child.get_edges())
@@ -98,14 +108,15 @@ def get_nodes(self):
         Get all the nodes of the tree in Cytoscape JSON format.
         :return: List of dictionaries, each specifying a node
         """
-        nodes = [
-            {
-                'data': {
-                    'id': self.node_id,
-                    **self.data
-                }
+        di = {
+            'data': {
+                'id': self.node_id
             }
-        ]
+        }
+
+        di['data'].update(self.data)
+        di.update(self.props)
+        nodes = [di]
 
         for child in self.children:
             nodes.extend(child.get_nodes())
@@ -155,3 +166,17 @@ def create_index(self):
                     stack.append(child)
 
         return self.index
+
+
+if __name__ == '__main__':
+    import pprint
+
+    t1 = Tree('a', data={'hello': 'goodbye'}, children=[
+        Tree('b', edge_data={'foo': 'bar'}, edge_props={'classes': 'directed'}),
+        Tree('c', props={'selected': True})
+    ])
+
+    print("Nodes:")
+    pprint.pprint(t1.get_nodes())
+    print('\nEdges:')
+    pprint.pprint(t1.get_edges())