[egg-list-box] add get_child_at_y () public method

[Guillaume Desmottes <gdesmott src gnome org>]

commit 360e782ad9d88c38b2ef66bb82e02baa9c7f63e6
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Mon Jun 4 13:49:05 2012 +0200

    add get_child_at_y () public method

 egg-list-box.vala |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/egg-list-box.vala b/egg-list-box.vala
index c7f03ba..d786163 100644
--- a/egg-list-box.vala
+++ b/egg-list-box.vala
@@ -69,6 +69,15 @@ public class Egg.ListBox : Container {
     return null;
   }
 
+  public unowned Widget? get_child_at_y (int y){
+      unowned ChildInfo? child = find_child_at_y (y);
+
+      if (child == null)
+        return null;
+
+      return child.widget;
+  }
+
   public void select_child (Widget? child) {
     unowned ChildInfo? info = null;
     if (child != null)