CRTransparentSearchFieldCell -- transparent search field cell

CRTransparentSearchFieldCell.h

#import <Cocoa/Cocoa.h>

@interface CRTransparentSearchFieldCell : NSSearchFieldCell

@end

CRTransparentSearchFieldCell.m

#import "CRTransparentSearchFieldCell.h"

@implementation CRTransparentSearchFieldCell

- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
    // Draw border.
    [[NSColor colorWithDeviceWhite:0 alpha:0.4] set];
    [[NSBezierPath bezierPathWithRoundedRect:NSInsetRect(cellFrame, 0.5, 0.5)
                                    xRadius:cellFrame.size.height/2.0
                                    yRadius:cellFrame.size.height/2.0] stroke];
    // Draw buttons and text.
    [self drawInteriorWithFrame:cellFrame inView:controlView];
}

@end

Oops, there's a bug.

Fixed.