diff --git a/AppKit/CPRuleEditor/CPRuleEditor.j b/AppKit/CPRuleEditor/CPRuleEditor.j
index 404c5546e..141e06d63 100644
--- a/AppKit/CPRuleEditor/CPRuleEditor.j
+++ b/AppKit/CPRuleEditor/CPRuleEditor.j
@@ -2121,7 +2121,7 @@ TODO: implement
         return;
 
     var point = [self convertPoint:[event locationInWindow] fromView:nil],
-        view = [_slices objectAtIndex:FLOOR(point.y / _sliceHeight)];
+        view = [_slices objectAtIndex:FLOOR(MAX(0, point.y) / _sliceHeight)];
 
     if ([self _dragShouldBeginFromMouseDown:view])
         [self _performDragForSlice:view withEvent:event];
diff --git a/AppKit/CPTabView.j b/AppKit/CPTabView.j
index baefde563..a99ee9c9d 100644
--- a/AppKit/CPTabView.j
+++ b/AppKit/CPTabView.j
@@ -34,6 +34,8 @@ CPNoTabsBezelBorder      = 4; //Displays no tabs and has a bezeled border.
 CPNoTabsLineBorder       = 5; //Has no tabs and displays a line border.
 CPNoTabsNoBorder         = 6; //Displays no tabs and no border.
 
+@class _CPTabViewBox
+
 var CPTabViewDidSelectTabViewItemSelector           = 1 << 1,
     CPTabViewShouldSelectTabViewItemSelector        = 1 << 2,
     CPTabViewWillSelectTabViewItemSelector          = 1 << 3,
@@ -64,7 +66,7 @@ var CPTabViewDidSelectTabViewItemSelector           = 1 << 1,
     CPArray                 _items;
 
     CPSegmentedControl      _tabs;
-    CPBox                   _box;
+    _CPTabViewBox           _box;
 
     CPNumber                _selectedIndex;
 
@@ -98,7 +100,8 @@ var CPTabViewDidSelectTabViewItemSelector           = 1 << 1,
     var height = [_tabs valueForThemeAttribute:@"min-size"].height;
     [_tabs setFrameSize:CGSizeMake(0, height)];
 
-    _box = [[CPBox alloc] initWithFrame:[self  bounds]];
+    _box = [[_CPTabViewBox alloc] initWithFrame:[self  bounds]];
+    [_box setTabView:self];
     [self setBackgroundColor:[CPColor colorWithCalibratedWhite:0.95 alpha:1.0]];
 
     [self addSubview:_box];
@@ -496,6 +499,18 @@ var CPTabViewDidSelectTabViewItemSelector           = 1 << 1,
         [self selectFirstTabViewItem:self];
 }
 
+
+#pragma mark -
+#pragma mark Override
+
+/*!
+    Enabled controls accept first mouse by default.
+*/
+- (BOOL)acceptsFirstMouse:(CPEvent)anEvent
+{
+    return YES;
+}
+
 @end
 
 var CPTabViewItemsKey               = "CPTabViewItemsKey",
@@ -571,3 +586,26 @@ var CPTabViewItemsKey               = "CPTabViewItemsKey",
 }
 
 @end
+
+@implementation _CPTabViewBox : CPBox
+{
+    CPTabView _tabView @accessors(property=tabView);
+}
+
+
+#pragma mark -
+#pragma mark Override
+
+- (CPView)hitTest:(CGPoint)aPoint
+{
+    // Here we check if we have clicked on the segmentedControl of the tabView or not
+    // If YES, the CPBox should not handle the click
+    var segmentIndex = [_tabView._tabs testSegment:[_tabView._tabs convertPoint:aPoint fromView:[self superview]]];
+
+    if (segmentIndex != CPNotFound)
+        return nil;
+
+    return [super hitTest:aPoint];
+}
+
+@end
\ No newline at end of file
diff --git a/AppKit/CPView.j b/AppKit/CPView.j
index 82db0b74c..e1b0fcaa2 100644
--- a/AppKit/CPView.j
+++ b/AppKit/CPView.j
@@ -2570,7 +2570,7 @@ setBoundsOrigin:
     }
 
 #if PLATFORM(DOM)
-    if (_needToSetTransformMatrix)
+    if (_needToSetTransformMatrix && _highDPIRatio !== 1)
         [_graphicsContext graphicsPort].setTransform(_highDPIRatio, 0, 0 , _highDPIRatio, 0, 0);
 #endif
 
diff --git a/AppKit/_CPToolTip.j b/AppKit/_CPToolTip.j
index 6268f8ab4..296293d02 100644
--- a/AppKit/_CPToolTip.j
+++ b/AppKit/_CPToolTip.j
@@ -176,6 +176,8 @@ var _CPToolTipHeight = 24.0,
         _toolTipWindow = aWindow;
         _constrainsToUsableScreen = NO;
 
+        [self setPlatformWindow:[_toolTipWindow platformWindow]];
+
         textFrameSize.height += 4;
 
         _content = [CPTextField labelWithTitle:aString];
@@ -193,6 +195,7 @@ var _CPToolTipHeight = 24.0,
         [self setAlphaValue:0.9];
 
         [_windowView setNeedsDisplay:YES];
+
     }
 
     return self;