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diff --git a/AppKit/GTMNSAnimatablePropertyContainer.m b/AppKit/GTMNSAnimatablePropertyContainer.m
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+++ b/AppKit/GTMNSAnimatablePropertyContainer.m
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+//
+//  GTMNSAnimatablePropertyContainer.m
+//
+//  Copyright (c) 2010 Google Inc. All rights reserved.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import "GTMNSAnimatablePropertyContainer.h"
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
+
+@interface GTMAnimatorStopper : NSObject {
+ @private
+  NSObject<NSAnimatablePropertyContainer> *container_;
+}
+@end
+
+@implementation GTMAnimatorStopper
+- (id)initWithAnimatablePropertyContainer:(NSObject<NSAnimatablePropertyContainer>*) container {
+  if ((self = [super init])) {
+    container_ = [container retain];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [container_ release];
+  [super dealloc];
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
+  return [container_ methodSignatureForSelector:aSelector];
+}
+
+- (void)forwardInvocation:(NSInvocation *)anInvocation {
+  SEL selector = [anInvocation selector];
+  NSString *selectorName = NSStringFromSelector(selector);
+
+  // NSWindow animator handles setFrame:display: which is an odd case
+  // for animator. All other methods take just a key value, so we convert
+  // this to it's equivalent key value.
+  if ([selectorName isEqual:@"setFrame:display:"]) {
+    selectorName = @"setFrame:";
+  }
+
+  // Check to make sure our selector is valid (starts with set and has a
+  // single : at the end.
+  NSRange colonRange = [selectorName rangeOfString:@":"];
+  NSUInteger selectorLength = [selectorName length];
+  if ([selectorName hasPrefix:@"set"]
+      && colonRange.location == selectorLength - 1
+      && selectorLength > 4) {
+    // transform our selector into a keyValue by removing the set
+    // and the colon and converting the first char down to lowercase.
+    NSString *keyValue = [selectorName substringFromIndex:3];
+    NSString *firstChar = [[keyValue substringToIndex:1] lowercaseString];
+    NSRange rest = NSMakeRange(1, [keyValue length] - 2);
+    NSString *restOfKey = [keyValue substringWithRange:rest];
+    keyValue = [firstChar stringByAppendingString:restOfKey];
+
+    // Save a copy of our old animations.
+    NSDictionary *oldAnimations
+      = [[[container_ animations] copy] autorelease];
+
+    // For frame the animator doesn't actually animate the rect but gets
+    // animators for the size and the origin independently. In case this changes
+    // in the future (similar to bounds), we will stop the animations for the
+    // frame as well as the frameSize and frameOrigin.
+    NSDictionary *animations = nil;
+    NSNull *null = [NSNull null];
+    if ([keyValue isEqual:@"frame"]) {
+      animations = [NSDictionary dictionaryWithObjectsAndKeys:
+                    null, @"frame",
+                    null, @"frameSize",
+                    null, @"frameOrigin", nil];
+    } else {
+      animations = [NSDictionary dictionaryWithObject:null forKey:keyValue];
+    }
+
+    // Set our animations to NULL which will force them to stop.
+    [container_ setAnimations:animations];
+    // Call our original invocation on our animator.
+    [anInvocation setTarget:[container_ animator]];
+    [anInvocation invoke];
+
+    // Reset the animations.
+    [container_ setAnimations:oldAnimations];
+  } else {
+    [self doesNotRecognizeSelector:selector];
+  }
+}
+
+@end
+
+@implementation NSView(GTMNSAnimatablePropertyContainer)
+
+- (id)gtm_animatorStopper {
+  return [[[GTMAnimatorStopper alloc] initWithAnimatablePropertyContainer:self]
+          autorelease];
+}
+
+@end
+
+@implementation NSWindow(GTMNSAnimatablePropertyContainer)
+
+- (id)gtm_animatorStopper {
+  return [[[GTMAnimatorStopper alloc] initWithAnimatablePropertyContainer:self]
+          autorelease];
+}
+
+@end
+
+#endif  // MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5