diff --git a/cocoa/base/PyDupeGuru.h b/cocoa/base/PyDupeGuru.h
index 04116cee..d50c7a0a 100644
--- a/cocoa/base/PyDupeGuru.h
+++ b/cocoa/base/PyDupeGuru.h
@@ -56,7 +56,6 @@ http://www.hardcoded.net/licenses/hs_license
 //Scanning options
 - (void)setMinMatchPercentage:(NSNumber *)percentage;
 - (void)setMixFileKind:(NSNumber *)mix_file_kind;
-- (void)setDisplayDeltaValues:(NSNumber *)display_delta_values;
 - (void)setEscapeFilterRegexp:(NSNumber *)escape_filter_regexp;
 - (void)setRemoveEmptyFolders:(NSNumber *)remove_empty_folders;
 - (void)setSizeThreshold:(NSInteger)size_threshold;
diff --git a/cocoa/base/PyResultTree.h b/cocoa/base/PyResultTree.h
index d416cec6..58251e63 100644
--- a/cocoa/base/PyResultTree.h
+++ b/cocoa/base/PyResultTree.h
@@ -10,7 +10,10 @@ http://www.hardcoded.net/licenses/hs_license
 #import "PyOutline.h"
 
 @interface PyResultTree : PyOutline
+- (BOOL)powerMarkerMode;
 - (void)setPowerMarkerMode:(BOOL)aPowerMarkerMode;
+- (BOOL)deltaValuesMode;
+- (void)setDeltaValuesMode:(BOOL)aDeltaValuesMode;
 
 - (NSString *)valueForPath:(NSArray *)aPath column:(NSInteger)aColumn;
 - (BOOL)renameSelected:(NSString *)aNewName;
diff --git a/cocoa/base/ResultOutline.h b/cocoa/base/ResultOutline.h
index d4ffe941..e50b6a5e 100644
--- a/cocoa/base/ResultOutline.h
+++ b/cocoa/base/ResultOutline.h
@@ -12,10 +12,14 @@ http://www.hardcoded.net/licenses/hs_license
 
 @interface ResultOutline : HSOutline
 {
-    NSMutableIndexSet *_deltaColumns;
+    NSIndexSet *_deltaColumns;
 }
 - (PyResultTree *)py;
+- (BOOL)powerMarkerMode;
 - (void)setPowerMarkerMode:(BOOL)aPowerMarkerMode;
+- (BOOL)deltaValuesMode;
+- (void)setDeltaValuesMode:(BOOL)aDeltaValuesMode;
+- (void)setDeltaColumns:(NSIndexSet *)aDeltaColumns;
 
 - (IBAction)markSelected:(id)sender;
 @end;
\ No newline at end of file
diff --git a/cocoa/base/ResultOutline.m b/cocoa/base/ResultOutline.m
index e148d170..c174f1bc 100644
--- a/cocoa/base/ResultOutline.m
+++ b/cocoa/base/ResultOutline.m
@@ -18,6 +18,12 @@ http://www.hardcoded.net/licenses/hs_license
     return self;
 }
 
+- (void)dealloc
+{
+    [_deltaColumns release];
+    [super dealloc];
+}
+
 - (PyResultTree *)py
 {
     return (PyResultTree *)py;
@@ -31,11 +37,32 @@ http://www.hardcoded.net/licenses/hs_license
 }
 
 /* Public */
+- (BOOL)powerMarkerMode
+{
+    return [[self py] powerMarkerMode];
+}
+
 - (void)setPowerMarkerMode:(BOOL)aPowerMarkerMode
 {
     [[self py] setPowerMarkerMode:aPowerMarkerMode];
 }
 
+- (BOOL)deltaValuesMode
+{
+    return [[self py] deltaValuesMode];
+}
+
+- (void)setDeltaValuesMode:(BOOL)aDeltaValuesMode
+{
+    [[self py] setDeltaValuesMode:aDeltaValuesMode];
+}
+
+- (void)setDeltaColumns:(NSIndexSet *)aDeltaColumns
+{
+    [_deltaColumns release];
+    _deltaColumns = [aDeltaColumns retain];
+}
+
 - (IBAction)markSelected:(id)sender
 {
     [[self py] markSelected];
@@ -96,12 +123,12 @@ http://www.hardcoded.net/licenses/hs_license
         else {
             [textCell setTextColor:[NSColor blueColor]];
         }
-        // if ((_displayDelta) && (_powerMode || ([node level] > 1))) {
-        //     NSInteger i = [[tableColumn identifier] integerValue];
-        //     if ([_deltaColumns containsIndex:i]) {
-        //         [textCell setTextColor:[NSColor orangeColor]];
-        //     }
-        // }
+        if (([self deltaValuesMode]) && ([self powerMarkerMode] || ([path length] > 1))) {
+            NSInteger i = [[tableColumn identifier] integerValue];
+            if ([_deltaColumns containsIndex:i]) {
+                [textCell setTextColor:[NSColor orangeColor]];
+            }
+        }
     }
 }
 @end
\ No newline at end of file
diff --git a/cocoa/base/ResultWindow.h b/cocoa/base/ResultWindow.h
index 2b24083e..92bfb640 100644
--- a/cocoa/base/ResultWindow.h
+++ b/cocoa/base/ResultWindow.h
@@ -27,10 +27,7 @@ http://www.hardcoded.net/licenses/hs_license
 	IBOutlet NSMenu *columnsMenu;
 	IBOutlet NSSearchField *filterField;
     
-    BOOL _powerMode;
-    BOOL _displayDelta;
     NSMutableArray *_resultColumns;
-    NSMutableIndexSet *_deltaColumns;
     NSWindowController *preferencesPanel;
     ResultOutline *outline;
 }
diff --git a/cocoa/base/ResultWindow.m b/cocoa/base/ResultWindow.m
index 42f0e5c5..e719cb14 100644
--- a/cocoa/base/ResultWindow.m
+++ b/cocoa/base/ResultWindow.m
@@ -33,8 +33,6 @@ http://www.hardcoded.net/licenses/hs_license
 @implementation ResultWindowBase
 - (void)awakeFromNib
 {
-    _displayDelta = NO;
-    _powerMode = NO;
     [self window];
     preferencesPanel = [[NSWindowController alloc] initWithWindowNibName:@"Preferences"];
     outline = [[ResultOutline alloc] initWithPyParent:py view:matches];
@@ -42,7 +40,6 @@ http://www.hardcoded.net/licenses/hs_license
     [self fillColumnsMenu];
     [deltaSwitch setSelectedSegment:0];
     [pmSwitch setSelectedSegment:0];
-    [py setDisplayDeltaValues:b2n(_displayDelta)];
     [matches setTarget:self];
     [matches setDoubleAction:@selector(openClicked:)];
     [self refreshStats];
@@ -116,7 +113,7 @@ http://www.hardcoded.net/licenses/hs_license
 
 - (NSArray *)getSelectedPaths:(BOOL)aDupesOnly
 {
-    if (_powerMode)
+    if ([outline powerMarkerMode])
         aDupesOnly = NO;
     NSIndexSet *indexes = [matches selectedRowIndexes];
     NSMutableArray *nodeList = [NSMutableArray array];
@@ -171,7 +168,7 @@ http://www.hardcoded.net/licenses/hs_license
 
 - (void)performPySelection:(NSArray *)aIndexPaths
 {
-    if (_powerMode) {
+    if ([outline powerMarkerMode]) {
         [py selectPowerMarkerNodePaths:aIndexPaths];
     }
     else {
@@ -203,15 +200,12 @@ http://www.hardcoded.net/licenses/hs_license
 
 - (IBAction)changeDelta:(id)sender
 {
-    _displayDelta = [deltaSwitch selectedSegment] == 1;
-    [py setDisplayDeltaValues:b2n(_displayDelta)];
-    [self reloadMatches];
+    [outline setDeltaValuesMode:[deltaSwitch selectedSegment] == 1];
 }
 
 - (IBAction)changePowerMarker:(id)sender
 {
-    _powerMode = [pmSwitch selectedSegment] == 1;
-    [outline setPowerMarkerMode:_powerMode];
+    [outline setPowerMarkerMode:[pmSwitch selectedSegment] == 1];
     // [self outlineView:matches didClickTableColumn:nil];
 }
 
diff --git a/cocoa/me/ResultWindow.h b/cocoa/me/ResultWindow.h
index 08ca8f9e..8fe6ca8a 100644
--- a/cocoa/me/ResultWindow.h
+++ b/cocoa/me/ResultWindow.h
@@ -10,10 +10,7 @@ http://www.hardcoded.net/licenses/hs_license
 #import "../base/ResultWindow.h"
 #import "DirectoryPanel.h"
 
-@interface ResultWindow : ResultWindowBase
-{
-    NSString *_lastAction;
-}
+@interface ResultWindow : ResultWindowBase {}
 - (IBAction)removeDeadTracks:(id)sender;
 - (IBAction)startDuplicateScan:(id)sender;
 @end
diff --git a/cocoa/me/ResultWindow.m b/cocoa/me/ResultWindow.m
index 7599fb4e..66e7d3f4 100644
--- a/cocoa/me/ResultWindow.m
+++ b/cocoa/me/ResultWindow.m
@@ -20,8 +20,9 @@ http://www.hardcoded.net/licenses/hs_license
 {
     [super awakeFromNib];
     [[self window] setTitle:@"dupeGuru Music Edition"];
-    _deltaColumns = [[NSMutableIndexSet indexSetWithIndexesInRange:NSMakeRange(2,7)] retain];
-    [_deltaColumns removeIndex:6];
+    NSMutableIndexSet *deltaColumns = [[NSMutableIndexSet indexSetWithIndexesInRange:NSMakeRange(2,7)] retain];
+    [deltaColumns removeIndex:6];
+    [outline setDeltaColumns:deltaColumns];
 }
 
 /* Actions */
diff --git a/core/app_cocoa.py b/core/app_cocoa.py
index d688d4b0..d9082d3c 100644
--- a/core/app_cocoa.py
+++ b/core/app_cocoa.py
@@ -46,7 +46,6 @@ class DupeGuru(app.DupeGuru):
         appdata = op.join(appsupport, appdata_subdir)
         app.DupeGuru.__init__(self, data_module, appdata, appid)
         self.progress = cocoa.ThreadedJobPerformer()
-        self.display_delta_values = False
     
     #--- Override
     @staticmethod
@@ -156,9 +155,3 @@ class DupeGuru(app.DupeGuru):
         dupes = [self.results.dupes[row] for row in rows if row in xrange(len(self.results.dupes))]
         self._select_dupes(dupes)
     
-    def sort_dupes(self,key,asc):
-        self.results.sort_dupes(key,asc,self.display_delta_values)
-    
-    def sort_groups(self,key,asc):
-        self.results.sort_groups(key,asc)
-    
diff --git a/core/app_cocoa_inter.py b/core/app_cocoa_inter.py
index 2cb9b3d1..7fc38488 100644
--- a/core/app_cocoa_inter.py
+++ b/core/app_cocoa_inter.py
@@ -131,9 +131,6 @@ class PyDupeGuruBase(PyRegistrable):
     def setMixFileKind_(self, mix_file_kind):
         self.py.scanner.mix_file_kind = mix_file_kind
     
-    def setDisplayDeltaValues_(self, display_delta_values):
-        self.py.display_delta_values= display_delta_values
-    
     def setEscapeFilterRegexp_(self, escape_filter_regexp):
         self.py.options['escape_filter_regexp'] = escape_filter_regexp
     
@@ -175,10 +172,22 @@ class PyDirectoryOutline(PyOutline):
 class PyResultOutline(PyOutline):
     py_class = ResultTree
     
+    @signature('c@:')
+    def powerMarkerMode(self):
+        return self.py.power_marker
+    
     @signature('v@:c')
     def setPowerMarkerMode_(self, value):
         self.py.power_marker = value
     
+    @signature('c@:')
+    def deltaValuesMode(self):
+        return self.py.delta_values
+    
+    @signature('v@:c')
+    def setDeltaValuesMode_(self, value):
+        self.py.delta_values = value
+    
     @signature('@@:@i')
     def valueForPath_column_(self, path, column):
         return self.py.get_node_value(path, column)
diff --git a/core/gui/result_tree.py b/core/gui/result_tree.py
index 392af649..4638e31e 100644
--- a/core/gui/result_tree.py
+++ b/core/gui/result_tree.py
@@ -34,6 +34,7 @@ class ResultTree(GUIObject, Tree):
         GUIObject.__init__(self, view, app)
         Tree.__init__(self)
         self._power_marker = False
+        self._delta_values = False
         self.connect()
         self._refresh()
         self.view.refresh()
@@ -60,16 +61,16 @@ class ResultTree(GUIObject, Tree):
             node = self.get_node(path)
         except IndexError:
             return '---'
-        if self.app.display_delta_values:
+        if self.delta_values:
             return node.data_delta[column]
         else:
             return node.data[column]
     
     def sort(self, key, asc):
         if self.power_marker:
-            self.app.sort_dupes(key, asc)
+            self.app.results.sort_dupes(key, asc, self.delta_values)
         else:
-            self.app.sort_groups(key, asc)
+            self.app.results.sort_groups(key, asc)
     
     @property
     def power_marker(self):
@@ -83,6 +84,18 @@ class ResultTree(GUIObject, Tree):
         self._refresh()
         self.view.refresh()
     
+    @property
+    def delta_values(self):
+        return self._delta_values
+    
+    @delta_values.setter
+    def delta_values(self, value):
+        if value == self._delta_values:
+            return
+        self._delta_values = value
+        self._refresh()
+        self.view.refresh()
+    
     @Tree.selected.setter
     def selected(self, node):
         self._selected = node