diff --git a/AppKit/_CPAttachedWindow.j b/AppKit/_CPAttachedWindow.j
index 2ac249dfa..610cdc78b 100644
--- a/AppKit/_CPAttachedWindow.j
+++ b/AppKit/_CPAttachedWindow.j
@@ -388,6 +388,14 @@ var _CPAttachedWindow_attachedWindowShouldClose_    = 1 << 0,
 #pragma mark -
 #pragma mark Overrides
 
+/*!
+    Attached windows, such as pop overs, can usually become the key window.
+*/
+- (BOOL)canBecomeKeyWindow
+{
+    return YES;
+}
+
 /*!
     Called when the window is losing focus.
 */