diff --git a/ChangeLog b/ChangeLog
index a791ce6e4..16ec3af36 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2012-02-29 10:25-EST Gregory John Casamento <greg.casamento@gmail.com>
+
+	* Source/GNUmakefile: Add GSXibLoading.m file to GNUmakefile.
+	* Source/GSXibLoading.m: Add some classes which I found
+	are relevant to Xib loading: IBAccessibilityAttribute,
+	IBUserDefinedRuntimeAttributesPlaceholder.
+
 2012-02-28  Eric Wasylishen  <ewasylishen@gmail.com>
 
 	* Source/NSPrintPanel.m: Add file type chooser (PDF, PostScript)
diff --git a/Source/GNUmakefile b/Source/GNUmakefile
index 77a936840..8c5048d23 100644
--- a/Source/GNUmakefile
+++ b/Source/GNUmakefile
@@ -183,6 +183,7 @@ NSToolbarItem.m \
 NSToolbarItemGroup.m \
 NSTokenField.m \
 NSTokenFieldCell.m \
+NSTreeController.m \
 NSUserDefaultsController.m \
 NSView.m \
 NSViewController.m \
@@ -239,7 +240,8 @@ GSGormLoader.m \
 GSGModelLoader.m \
 GSNibLoader.m \
 GSXibLoader.m \
-GSHelpAttachment.m
+GSXibLoading.m \
+GSHelpAttachment.m 
 
 # Turn off NSMenuItem warning that NSMenuItem conforms to <NSObject>,
 # but does not implement <NSObject>'s methods itself (it inherits
@@ -386,6 +388,7 @@ NSToolbarItem.h \
 NSToolbarItemGroup.h \
 NSTokenField.h \
 NSTokenFieldCell.h \
+NSTreeController.h \
 NSUserDefaultsController.h \
 NSView.h \
 NSViewController.h \
diff --git a/Source/GSXibLoading.m b/Source/GSXibLoading.m
new file mode 100644
index 000000000..c04c4162b
--- /dev/null
+++ b/Source/GSXibLoading.m
@@ -0,0 +1,94 @@
+#import <Foundation/NSObject.h>
+#import <Foundation/NSKeyedArchiver.h>
+
+@interface IBUserDefinedRuntimeAttributesPlaceholder : NSObject <NSCoding>
+{
+  NSString *typeIdentifier;
+  NSString *keyPath;
+  id value;
+}
+
+- (void) setTypeIdentifier: (NSString *)type;
+- (NSString *) typeIdentifier;
+
+- (void) setKeyPath: (NSString *)keyPath;
+- (NSString *) keyPath;
+
+- (void) setValue: (id)value;
+- (id) value;
+
+@end
+
+@interface IBAccessibilityAttribute : NSObject <NSCoding>
+@end
+
+@implementation IBUserDefinedRuntimeAttributesPlaceholder
+
+- (void) encodeWithCoder: (NSCoder *)coder
+{
+  if([coder allowsKeyedCoding])
+    {
+      [coder encodeObject: typeIdentifier
+		   forKey: @"typeIdentifier"];
+      [coder encodeObject: keyPath
+		   forKey: @"keyPath"];
+      [coder encodeObject: value 
+		   forKey: @"value"];
+    }
+}
+
+- (id) initWithCoder: (NSCoder *)coder
+{
+  if([coder allowsKeyedCoding])
+    {
+      [self setTypeIdentifier: [coder decodeObjectForKey: @"typeIdentifier"]];
+      [self setKeyPath: [coder decodeObjectForKey: @"keyPath"]];
+      [self setValue: [coder decodeObjectForKey: @"value"]];
+    }
+  return self;
+}
+
+- (void) setTypeIdentifier: (NSString *)type
+{
+  ASSIGN(typeIdentifier, type);
+}
+
+- (NSString *) typeIdentifier
+{
+  return typeIdentifier;
+}
+
+- (void) setKeyPath: (NSString *)kpath
+{
+  ASSIGN(keyPath, kpath);
+}
+
+- (NSString *) keyPath
+{
+  return keyPath;
+}
+
+- (void) setValue: (id)val
+{
+  ASSIGN(value, val);
+}
+
+- (id) value
+{
+  return value;
+}
+
+@end
+
+@implementation IBAccessibilityAttribute
+
+- (void) encodeWithCoder: (NSCoder *)coder
+{
+}
+
+- (id) initWithCoder: (NSCoder *)coder
+{
+  return self;
+}
+
+@end