diff -r e55a17cdabd2 -r 3d3dcc3116d5 UniqueWindowController.m
--- a/UniqueWindowController.m	Thu Mar 20 09:05:58 2008 -0700
+++ b/UniqueWindowController.m	Wed Apr 02 14:45:33 2008 -0700
@@ -7,6 +7,7 @@
 //
 
 #import "UniqueWindowController.h"
+#import "GraphicsUtils.h"
 
 
 @implementation UniqueWindowController
@@ -14,13 +15,10 @@
 
 + (UniqueWindowController*) instanceWith: (id)model
 {
-    for( NSWindow *window in [NSApp windows] ) {
-        id delegate = window.delegate;
-        if( window.isVisible && [delegate isKindOfClass: [self class]] ) {
-            UniqueWindowController *c = delegate;
-            if( c.model == model )
-                return c;
-        }
+    for( NSWindow *window in OpenWindowsWithDelegateClass(self) ) {
+        UniqueWindowController *c = window.delegate;
+        if( c.model == model )
+            return c;
     }
     return nil;
 }