diff --git a/CTCheckbox/CTCheckbox.m b/CTCheckbox/CTCheckbox.m
index d4cce37..74fa512 100644
--- a/CTCheckbox/CTCheckbox.m
+++ b/CTCheckbox/CTCheckbox.m
@@ -8,6 +8,8 @@
 
 #import "CTCheckbox.h"
 
+static const float CTCheckboxDefaultSideLength = 20.0;
+
 @implementation CTCheckbox
 
 - (id)initWithFrame:(CGRect)frame
@@ -30,10 +32,11 @@ - (id)initWithCoder:(NSCoder *)aDecoder
 
 - (void)setUp
 {
-    self.checkboxSideLength = 20.0;
+    self.checkboxSideLength = CTCheckboxDefaultSideLength;
     self.checkboxColor = [UIColor blackColor];
     self.backgroundColor = [UIColor clearColor];
     self.textLabel = [[UILabel alloc] initWithFrame:CGRectZero];
+    self.textLabel.backgroundColor = [UIColor clearColor];
     [self addSubview:self.textLabel];
 }
 
@@ -49,41 +52,27 @@ - (void)setChecked:(BOOL)checked
 - (void)drawRect:(CGRect)rect
 {
     CGRect frame = CGRectIntegral(CGRectMake(0, (rect.size.height - self.checkboxSideLength) / 2.0, self.checkboxSideLength, self.checkboxSideLength));
-    UIBezierPath *bezierPath = [UIBezierPath bezierPath];
 
     if (self.checked) {
-        [bezierPath moveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.75000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.21875 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.40000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.52500 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.28125 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.37500 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.17500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.47500 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.40000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.75000 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.81250 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.28125 * CGRectGetHeight(frame))];
-        [bezierPath addLineToPoint: CGPointMake(CGRectGetMinX(frame) + 0.75000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.21875 * CGRectGetHeight(frame))];
+        UIBezierPath *bezierPath = [UIBezierPath bezierPath];
+
+        [bezierPath moveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.75000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.21875 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.40000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.52500 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.28125 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.37500 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.17500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.47500 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.40000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.75000 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.81250 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.28125 * CGRectGetHeight(frame))];
+        [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.75000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.21875 * CGRectGetHeight(frame))];
         [bezierPath closePath];
+
+        [self.checkboxColor setFill];
+        [bezierPath fill];
     }
 
-    [bezierPath moveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.87500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.12500 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.87500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.87500 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.12500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.87500 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.12500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.12500 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.87500 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.12500 * CGRectGetHeight(frame))];
-    [bezierPath closePath];
-    [bezierPath moveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.90625 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.09375 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame))];
-    [bezierPath addCurveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.09375 * CGRectGetHeight(frame)) controlPoint1:CGPointMake(CGRectGetMinX(frame) + 0.04219 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame)) controlPoint2:CGPointMake(CGRectGetMinX(frame) + 0.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04219 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.90625 * CGRectGetHeight(frame))];
-    [bezierPath addCurveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.09375 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 1.00000 * CGRectGetHeight(frame)) controlPoint1:CGPointMake(CGRectGetMinX(frame) + 0.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.95781 * CGRectGetHeight(frame)) controlPoint2:CGPointMake(CGRectGetMinX(frame) + 0.04219 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 1.00000 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.90625 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 1.00000 * CGRectGetHeight(frame))];
-    [bezierPath addCurveToPoint:CGPointMake(CGRectGetMinX(frame) + 1.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.90625 * CGRectGetHeight(frame)) controlPoint1:CGPointMake(CGRectGetMinX(frame) + 0.95781 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 1.00000 * CGRectGetHeight(frame)) controlPoint2:CGPointMake(CGRectGetMinX(frame) + 1.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.95781 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 1.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.09375 * CGRectGetHeight(frame))];
-    [bezierPath addCurveToPoint:CGPointMake(CGRectGetMinX(frame) + 0.90625 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame)) controlPoint1:CGPointMake(CGRectGetMinX(frame) + 1.00000 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04219 * CGRectGetHeight(frame)) controlPoint2:CGPointMake(CGRectGetMinX(frame) + 0.95781 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame))];
-    [bezierPath addLineToPoint:CGPointMake(CGRectGetMinX(frame) + 0.90625 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.00000 * CGRectGetHeight(frame))];
-    [bezierPath closePath];
-    bezierPath.miterLimit = 4;
-
-
-    [self.checkboxColor setFill];
-    [bezierPath fill];
+    UIBezierPath *roundedRectanglePath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(CGRectGetMinX(frame) + floor(CGRectGetWidth(frame) * 0.05000 + 0.5), CGRectGetMinY(frame) + floor(CGRectGetHeight(frame) * 0.05000 + 0.5), floor(CGRectGetWidth(frame) * 0.95000 + 0.5) - floor(CGRectGetWidth(frame) * 0.05000 + 0.5), floor(CGRectGetHeight(frame) * 0.95000 + 0.5) - floor(CGRectGetHeight(frame) * 0.05000 + 0.5)) cornerRadius:4];
+    roundedRectanglePath.lineWidth = 2 * self.checkboxSideLength / CTCheckboxDefaultSideLength;
+    [self.checkboxColor setStroke];
+    [roundedRectanglePath stroke];
 }
 
 - (void)layoutSubviews
diff --git a/CTCheckboxSample/CTViewController.h b/CTCheckboxSample/CTViewController.h
index e022d2e..8766afd 100644
--- a/CTCheckboxSample/CTViewController.h
+++ b/CTCheckboxSample/CTViewController.h
@@ -10,9 +10,10 @@
 
 @class CTCheckbox;
 
-@interface CTViewController : UIViewController
+@interface CTViewController : UIViewController <UITextFieldDelegate>
 
 @property (weak, nonatomic) IBOutlet CTCheckbox *checkbox;
+@property (weak, nonatomic) IBOutlet UITextField *textField;
 @property (weak, nonatomic) IBOutlet UILabel *label;
 
 - (IBAction)blackButtonTapped:(id)sender;
diff --git a/CTCheckboxSample/CTViewController.m b/CTCheckboxSample/CTViewController.m
index f3a7d97..d050163 100644
--- a/CTCheckboxSample/CTViewController.m
+++ b/CTCheckboxSample/CTViewController.m
@@ -12,6 +12,7 @@
 @interface CTViewController ()
 
 @property (nonatomic, strong) CTCheckbox *checkbox2;
+@property (nonatomic, strong) CTCheckbox *checkbox3;
 @end
 
 @implementation CTViewController
@@ -25,11 +26,17 @@ - (void)viewDidLoad
     [self checkboxDidChanged:self.checkbox];
 
     self.checkbox2 = [[CTCheckbox alloc] initWithFrame:CGRectMake(20.0, 200.0, 280.0, 20.0)];
-    self.checkbox2.textLabel.text= @"by initWithFrame:";
+    self.checkbox2.textLabel.text = @"by initWithFrame:";
     [self.view addSubview:self.checkbox2];
+
+    self.checkbox3 = [[CTCheckbox alloc] initWithFrame:CGRectMake(20.0, 240.0, 280.0, 40.0)];
+    self.checkbox3.checkboxSideLength = 40.0;
+    self.checkbox3.textLabel.text = @"checkboxSideLength is 40.0";
+    [self.view addSubview:self.checkbox3];
 }
 
-- (void)checkboxDidChanged:(CTCheckbox *)checkbox {
+- (void)checkboxDidChanged:(CTCheckbox *)checkbox
+{
     if (checkbox.checked) {
         self.label.text = @"Checked";
     } else {
@@ -43,23 +50,35 @@ - (void)didReceiveMemoryWarning
     // Dispose of any resources that can be recreated.
 }
 
-- (IBAction)blackButtonTapped:(id)sender {
-    self.checkbox.checkboxColor=[UIColor blackColor];
+- (IBAction)blackButtonTapped:(id)sender
+{
+    self.checkbox.checkboxColor = [UIColor blackColor];
     [self.checkbox setNeedsDisplay];
 }
 
-- (IBAction)blueButtonTapped:(id)sender {
-    self.checkbox.checkboxColor=[UIColor blueColor];
+- (IBAction)blueButtonTapped:(id)sender
+{
+    self.checkbox.checkboxColor = [UIColor blueColor];
     [self.checkbox setNeedsDisplay];
 }
 
-- (IBAction)redButtonTapped:(id)sender {
-    self.checkbox.checkboxColor=[UIColor redColor];
+- (IBAction)redButtonTapped:(id)sender
+{
+    self.checkbox.checkboxColor = [UIColor redColor];
     [self.checkbox setNeedsDisplay];
 }
 
-- (IBAction)textChanged:(id)sender {
-    self.checkbox.textLabel.text= [(UITextField *)sender text];
+- (IBAction)textChanged:(id)sender
+{
+    self.checkbox.textLabel.text = [(UITextField *)sender text];
+}
+
+#pragma mark - UITextField delegate
+
+- (BOOL)textFieldShouldReturn:(UITextField *)textField
+{
+    [textField resignFirstResponder];
+    return YES;
 }
 
 @end
diff --git a/CTCheckboxSample/en.lproj/MainStoryboard.storyboard b/CTCheckboxSample/en.lproj/MainStoryboard.storyboard
index eda435c..f54ce32 100644
--- a/CTCheckboxSample/en.lproj/MainStoryboard.storyboard
+++ b/CTCheckboxSample/en.lproj/MainStoryboard.storyboard
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="2.0" toolsVersion="3084" systemVersion="12C3103" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" initialViewController="2">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="4514" systemVersion="13B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" initialViewController="2">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="2083"/>
+        <deployment defaultVersion="1280" identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3747"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -9,73 +10,59 @@
             <objects>
                 <viewController id="2" customClass="CTViewController" sceneMemberID="viewController">
                     <view key="view" contentMode="scaleToFill" id="3">
-                        <rect key="frame" x="0.0" y="20" width="320" height="548"/>
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <subviews>
                             <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="w84-Ow-HeX">
-                                <rect key="frame" x="80" y="68" width="160" height="21"/>
+                                <rect key="frame" x="80" y="78" width="160" height="21"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                 <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
                                 <nil key="highlightedColor"/>
                             </label>
                             <view contentMode="scaleToFill" id="1v1-mg-H3z" customClass="CTCheckbox">
-                                <rect key="frame" x="20" y="20" width="280" height="40"/>
+                                <rect key="frame" x="20" y="30" width="280" height="40"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                             </view>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" id="MzV-rU-Ib4">
-                                <rect key="frame" x="47" y="135" width="65" height="44"/>
+                                <rect key="frame" x="47" y="145" width="65" height="44"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                 <state key="normal" title="Black">
-                                    <color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
                                     <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                                 </state>
-                                <state key="highlighted">
-                                    <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
-                                </state>
                                 <connections>
                                     <action selector="blackButtonTapped:" destination="2" eventType="touchUpInside" id="IJ3-J8-DXy"/>
                                 </connections>
                             </button>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" id="2o1-Gs-Zyf">
-                                <rect key="frame" x="130" y="135" width="65" height="44"/>
+                                <rect key="frame" x="130" y="145" width="65" height="44"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                 <state key="normal" title="Blue">
-                                    <color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
                                     <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                                 </state>
-                                <state key="highlighted">
-                                    <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
-                                </state>
                                 <connections>
                                     <action selector="blueButtonTapped:" destination="2" eventType="touchUpInside" id="yVF-r6-NYc"/>
                                 </connections>
                             </button>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" id="EyO-OX-kci">
-                                <rect key="frame" x="208" y="135" width="65" height="44"/>
+                                <rect key="frame" x="208" y="145" width="65" height="44"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
                                 <state key="normal" title="Red">
-                                    <color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
                                     <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                                 </state>
-                                <state key="highlighted">
-                                    <color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
-                                </state>
                                 <connections>
                                     <action selector="redButtonTapped:" destination="2" eventType="touchUpInside" id="ZXh-YK-qCl"/>
                                 </connections>
                             </button>
                             <textField opaque="NO" clipsSubviews="YES" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" minimumFontSize="17" id="Rwf-kZ-6DK">
-                                <rect key="frame" x="47" y="97" width="226" height="30"/>
+                                <rect key="frame" x="47" y="107" width="226" height="30"/>
                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                 <textInputTraits key="textInputTraits" returnKeyType="done"/>
                                 <connections>
                                     <action selector="textChanged:" destination="2" eventType="editingChanged" id="Pzz-uI-Byz"/>
+                                    <outlet property="delegate" destination="2" id="ws1-ys-JAD"/>
                                 </connections>
                             </textField>
                         </subviews>
@@ -84,28 +71,13 @@
                     <connections>
                         <outlet property="checkbox" destination="1v1-mg-H3z" id="X7z-mk-Fho"/>
                         <outlet property="label" destination="w84-Ow-HeX" id="PGt-Dk-LqD"/>
+                        <outlet property="textField" destination="Rwf-kZ-6DK" id="rzr-j1-Wco"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="4" sceneMemberID="firstResponder"/>
             </objects>
         </scene>
     </scenes>
-    <classes>
-        <class className="CTCheckbox" superclassName="UIControl">
-            <source key="sourceIdentifier" type="project" relativePath="./Classes/CTCheckbox.h"/>
-        </class>
-        <class className="CTViewController" superclassName="UIViewController">
-            <source key="sourceIdentifier" type="project" relativePath="./Classes/CTViewController.h"/>
-            <relationships>
-                <relationship kind="action" name="blackButtonTapped:"/>
-                <relationship kind="action" name="blueButtonTapped:"/>
-                <relationship kind="action" name="redButtonTapped:"/>
-                <relationship kind="action" name="textChanged:"/>
-                <relationship kind="outlet" name="checkbox" candidateClass="CTCheckbox"/>
-                <relationship kind="outlet" name="label" candidateClass="UILabel"/>
-            </relationships>
-        </class>
-    </classes>
     <simulatedMetricsContainer key="defaultSimulatedMetrics">
         <simulatedStatusBarMetrics key="statusBar"/>
         <simulatedOrientationMetrics key="orientation"/>