diff --git a/lib/tfw/components/source_code_event_handler.py b/lib/tfw/components/source_code_event_handler.py
index b780c98..5785064 100644
--- a/lib/tfw/components/source_code_event_handler.py
+++ b/lib/tfw/components/source_code_event_handler.py
@@ -9,8 +9,8 @@ log = logging.getLogger(__name__)
 
 
 class FileManager:
-    def __init__(self, working_directory, selected_file=None):
-        self.exclude = ['__pycache__']
+    def __init__(self, working_directory, selected_file=None, exclude=None):
+        self.exclude = exclude if exclude is not None else []
         self._workdir = None
         self.workdir = working_directory
         self.filename = selected_file or self.files[0]
@@ -54,9 +54,9 @@ class FileManager:
 
 
 class SourceCodeEventHandler(TriggerlessEventHandler):
-    def __init__(self, key, directory, selected_file=None):
+    def __init__(self, key, directory, selected_file=None, exclude=None):
         super().__init__(key)
-        self.filemanager = FileManager(directory, selected_file=selected_file)
+        self.filemanager = FileManager(directory, selected_file=selected_file, exclude=exclude)
 
         self.commands = {
             'read': self.read,
diff --git a/src/demo/event_handler_main.py b/src/demo/event_handler_main.py
index 9d5976c..1c2de2d 100644
--- a/src/demo/event_handler_main.py
+++ b/src/demo/event_handler_main.py
@@ -9,7 +9,7 @@ log = logging.getLogger(__name__)
 
 
 if __name__ == '__main__':
-    ide = SourceCodeEventHandler('webide', tfwenv.WEBIDE_WD)
+    ide = SourceCodeEventHandler('webide', tfwenv.WEBIDE_WD, ['__pycache__'])
     terminado = TerminadoEventHandler('shell')
     terminado.historymonitor.subscribe_callback(lambda hist: log.debug('User executed command: "{}"'.format(hist[-1])))
     processmanager = ProcessManagingEventHandler('processmanager', ide.monitor)