diff -r a59acc683080 -r 6c78cc6bd7a6 Source/GGBLayer.m
--- a/Source/GGBLayer.m	Thu May 29 15:04:06 2008 -0700
+++ b/Source/GGBLayer.m	Thu Jul 03 17:44:30 2008 -0700
@@ -288,3 +288,12 @@
 }    
 
 
+CGColorRef GetEffectiveBackground( CALayer *layer )
+{
+    for( ; layer; layer=layer.superlayer ) {
+        CGColorRef bg = layer.backgroundColor;
+        if( bg )
+            return bg;
+    }
+    return nil;
+}