From 439003d7091eecfc05262372eeb5b3dec9549944 Mon Sep 17 00:00:00 2001
From: zah <zaharid@gmail.com>
Date: Sun, 23 Feb 2014 19:57:07 +0100
Subject: [PATCH] Children fire event

Now when a container widget is displayed, the _handle_displayed method
of each of its children is fired.
---
 IPython/html/widgets/widget_container.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/IPython/html/widgets/widget_container.py b/IPython/html/widgets/widget_container.py
index ddfccd560..251aa7850 100644
--- a/IPython/html/widgets/widget_container.py
+++ b/IPython/html/widgets/widget_container.py
@@ -27,6 +27,15 @@ class ContainerWidget(DOMWidget):
     children = List(Instance(DOMWidget))
     _children = List(Instance(DOMWidget), sync=True)
 
+
+    def __init__(self, **kwargs):
+        super(ContainerWidget, self).__init__(**kwargs)
+        self.on_displayed(ContainerWidget._fire_children_displayed)
+
+    def _fire_children_displayed(self):
+        for child in self._children:
+            child._handle_displayed()
+
     def _children_changed(self, name, old, new):
         """Validate children list.