diff --git a/simplesvnbrowser/__init__.py b/simplesvnbrowser/__init__.py
index 3439a8c..7cf09a2 100644
--- a/simplesvnbrowser/__init__.py
+++ b/simplesvnbrowser/__init__.py
@@ -1,9 +1,3 @@
-from simplesvnbrowser.main_window import MainWindow
-import subprocess
-
-def run_svn(args):
-    completed_process = subprocess.run(
-            ["svn", "--non-interactive"] + args,
-            stdout = subprocess.PIPE,
-            stderr = subprocess.PIPE)
-    return completed_process.stdout.decode(), completed_process.stderr.decode()
+from .main_window import MainWindow
+from .run_svn import run_svn
+from .version import VERSION
diff --git a/simplesvnbrowser/cli.py b/simplesvnbrowser/cli.py
index 599a3a3..2b531d5 100644
--- a/simplesvnbrowser/cli.py
+++ b/simplesvnbrowser/cli.py
@@ -11,7 +11,8 @@ def run(argv):
             wc_path = argv[1]
     if url is None:
         url = determine_url_from_wc(wc_path)
-    # TODO: start with url
+    mw = simplesvnbrowser.MainWindow(url)
+    mw.run()
 
 def determine_url_from_wc(path):
     stdout, _ = simplesvnbrowser.run_svn(["info", path])
diff --git a/simplesvnbrowser/main_window.py b/simplesvnbrowser/main_window.py
index 1c2840e..6f47415 100644
--- a/simplesvnbrowser/main_window.py
+++ b/simplesvnbrowser/main_window.py
@@ -1,3 +1,18 @@
-class MainWindow:
-    def __init__(self):
-        pass
+import gi
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk
+from .version import VERSION
+from .run_svn import run_svn
+
+class MainWindow(Gtk.Window):
+    def __init__(self, url):
+        super().__init__(title = "Simple SVN Browser v%s" % VERSION)
+
+        button = Gtk.Button(label = "content")
+        self.add(button)
+
+        self.connect("delete-event", Gtk.main_quit)
+        self.show_all()
+
+    def run(self):
+        Gtk.main()
diff --git a/simplesvnbrowser/run_svn.py b/simplesvnbrowser/run_svn.py
new file mode 100644
index 0000000..c109aa2
--- /dev/null
+++ b/simplesvnbrowser/run_svn.py
@@ -0,0 +1,8 @@
+import subprocess
+
+def run_svn(args):
+    completed_process = subprocess.run(
+            ["svn", "--non-interactive"] + args,
+            stdout = subprocess.PIPE,
+            stderr = subprocess.PIPE)
+    return completed_process.stdout.decode(), completed_process.stderr.decode()
diff --git a/simplesvnbrowser/version.py b/simplesvnbrowser/version.py
new file mode 100644
index 0000000..901e511
--- /dev/null
+++ b/simplesvnbrowser/version.py
@@ -0,0 +1 @@
+VERSION = "0.0.1"