Add default button style

AppKit/CPButton.j

@@ -431,6 +431,20 @@ var _CPButtonClassName                          = nil,
     }
 }
 
+- (void)setDefaultButton:(BOOL)shouldBeDefaultButton
+{
+    if ((!!(_controlState & CPControlStateDefault)) === shouldBeDefaultButton)
+        return;
+
+    if (shouldBeDefaultButton)
+        _controlState |= CPControlStateDefault;
+    else
+        _controlState &= ~CPControlStateDefault;
+
+    [self setNeedsLayout];
+    [self setNeedsDisplay:YES];
+}
+
 @end
 
 @implementation CPButton (NS)

AppKit/CPWindow/CPWindow.j

@@ -1721,7 +1721,11 @@ CPTexturedBackgroundWindowMask
 
 - (void)setDefaultButton:(CPButton)aButton
 {
+    [_defaultButton setDefaultButton:NO];
+
     _defaultButton = aButton;
+
+    [_defaultButton setDefaultButton:YES];    
 }
 
 - (CPButton)defaultButton

AppKit/Themes/Aristo/ThemeDescriptors.j

@@ -173,7 +173,7 @@
                 [_CPCibCustomResource imageResourceWithName:"button-bezel-center.png" size:CGSizeMake(1.0, 24.0)],
                 [_CPCibCustomResource imageResourceWithName:"button-bezel-right.png" size:CGSizeMake(4.0, 24.0)]
             ]
-        isVertical:NO]];
+        isVertical:NO]],
 
         highlightedBezelColor = [CPColor colorWithPatternImage:[[CPThreePartImage alloc] initWithImageSlices:
             [
@@ -181,7 +181,24 @@
                 [_CPCibCustomResource imageResourceWithName:"button-bezel-highlighted-center.png" size:CGSizeMake(1.0, 24.0)],
                 [_CPCibCustomResource imageResourceWithName:"button-bezel-highlighted-right.png" size:CGSizeMake(4.0, 24.0)]
             ]
+        isVertical:NO]],
+
+        defaultBezelColor = [CPColor colorWithPatternImage:[[CPThreePartImage alloc] initWithImageSlices:
+            [
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-left.png" size:CGSizeMake(4.0, 24.0)],
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-center.png" size:CGSizeMake(1.0, 24.0)],
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-right.png" size:CGSizeMake(4.0, 24.0)]
+            ]
+        isVertical:NO]],
+
+        defaultHighlightedBezelColor = [CPColor colorWithPatternImage:[[CPThreePartImage alloc] initWithImageSlices:
+            [
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-highlighted-left.png" size:CGSizeMake(4.0, 24.0)],
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-highlighted-center.png" size:CGSizeMake(1.0, 24.0)],
+                [_CPCibCustomResource imageResourceWithName:"default-button-bezel-highlighted-right.png" size:CGSizeMake(4.0, 24.0)]
+            ]
         isVertical:NO]];
+
                 
     [button setTitle:@"Cancel"];
     
@@ -195,6 +212,10 @@
     [button setValue:highlightedBezelColor forThemedAttributeName:@"bezel-color" inControlState:CPControlStateBordered|CPControlStateHighlighted];
     [button setValue:CGInsetMake(0.0, 5.0, 0.0, 5.0) forThemedAttributeName:@"content-inset" inControlState:CPControlStateBordered];
 
+    [button setValue:defaultBezelColor forThemedAttributeName:@"bezel-color" inControlState:CPControlStateBordered|CPControlStateDefault];
+    [button setValue:defaultHighlightedBezelColor forThemedAttributeName:@"bezel-color" inControlState:CPControlStateBordered|CPControlStateHighlighted|CPControlStateDefault];
+    [button setValue:[CPColor colorWithCalibratedRed:13.0/255.0 green:51.0/255.0 blue:70.0/255.0 alpha:1.0] forThemedAttributeName:@"text-color" inControlState:CPControlStateDefault];
+
     [button setValue:24.0 forThemedAttributeName:@"default-height"];
 
     return button;