diff --git a/MathPad/MPExpressionView.m b/MathPad/MPExpressionView.m
index e3647d5..4b89886 100644
--- a/MathPad/MPExpressionView.m
+++ b/MathPad/MPExpressionView.m
@@ -24,7 +24,7 @@
 
 @interface MPExpressionView ()
 
-@property (nonatomic, weak) NSButton *functionsButton;
+@property (nonatomic, strong) NSButton *functionsButton;
 @property (nonatomic, strong) NSPopover *functionsPopover;
 @property (nonatomic, strong) MPFunctionsViewController *functionsViewController;
 
@@ -312,30 +312,31 @@
     expressionStorage.expressionView = self;
     _expressionStorage = expressionStorage;
     
-    NSBundle *frameworkBundle = [NSBundle bundleForClass:[self class]];
-    NSImage *image = [frameworkBundle imageForResource:@"FunctionsButtonDisclosure"];
-    [image setName:@"FunctionsButtonDisclosure"];
-    // Setup the Functions Button
-    NSButton *button = [[NSButton alloc] initWithFrame:NSZeroRect];
-    button.target = self;
-    button.action = @selector(showFunctions:);
-    button.buttonType = NSMomentaryChangeButton;
-    button.bezelStyle = NSShadowlessSquareBezelStyle;
-    button.bordered = NO;
-    NSFont *font = [NSFont fontWithName:@"Times New Roman" size:25.0];
-    NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:@"Σ" attributes:@{NSFontAttributeName: font, NSForegroundColorAttributeName: [NSColor colorWithWhite:.61 alpha:1]}];
-    button.attributedTitle = attributedTitle;
-    button.imagePosition = NSImageLeft;
-    button.image = image;
-    self.functionsButton = button;
-    [self addSubview:self.functionsButton];
+    [self initializeButtons];
     
-    // Setup Selection
     self.selection = [[MPRangePath alloc] initWithRange:NSMakeRange(0, 0)];
     self.caretBlinkRate = 1.0;
     [self restartCaretTimer];
 }
 
+- (void)initializeButtons
+{
+    NSButton *functionsButton = self.functionsButton;
+    [self addSubview:functionsButton];
+    NSDictionary *variableBindings = NSDictionaryOfVariableBindings(functionsButton);
+    [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"[functionsButton]-10-|"
+                                                                 options:0
+                                                                 metrics:nil
+                                                                   views:variableBindings]];
+    [self addConstraint:[NSLayoutConstraint constraintWithItem:functionsButton
+                                                     attribute:NSLayoutAttributeCenterY
+                                                     relatedBy:NSLayoutRelationEqual
+                                                        toItem:self
+                                                     attribute:NSLayoutAttributeCenterY
+                                                    multiplier:1
+                                                      constant:0]];
+}
+
 #pragma mark Properties
 - (void)setExpressionStorage:(MPExpressionStorage *)expressionStorage
 {
@@ -358,6 +359,29 @@
     self.needsDisplay = YES;
 }
 
+- (NSButton *)functionsButton
+{
+    if (!_functionsButton) {
+        NSBundle *frameworkBundle = [NSBundle bundleForClass:[self class]];
+        NSImage *image = [frameworkBundle imageForResource:@"FunctionsButtonDisclosure"];
+        [image setName:@"FunctionsButtonDisclosure"];
+        NSButton *button = [[NSButton alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
+        button.translatesAutoresizingMaskIntoConstraints = NO;
+        button.target = self;
+        button.action = @selector(showFunctions:);
+        button.buttonType = NSMomentaryChangeButton;
+        button.bezelStyle = NSShadowlessSquareBezelStyle;
+        button.bordered = NO;
+        NSFont *font = [NSFont fontWithName:@"Times New Roman" size:25.0];
+        NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:@"Σ" attributes:@{NSFontAttributeName: font, NSForegroundColorAttributeName: [NSColor colorWithWhite:.61 alpha:1]}];
+        button.attributedTitle = attributedTitle;
+        button.imagePosition = NSImageLeft;
+        button.image = image;
+        _functionsButton = button;
+    }
+    return _functionsButton;
+}
+
 #pragma mark Actions
 - (void)showFunctions:(id)sender
 {
@@ -429,16 +453,6 @@
     [super setFrame:frameRect];
 }
 
-- (void)layout
-{
-    NSSize buttonSize = [self.functionsButton fittingSize];
-    self.functionsButton.frame = NSMakeRect(self.bounds.size.width - buttonSize.width - 10,
-                                            (self.bounds.size.height - buttonSize.height) / 2,
-                                            buttonSize.width,
-                                            buttonSize.height);
-    [super layout];
-}
-
 - (NSSize)intrinsicContentSize
 {
     NSSize size = self.expressionStorage.rootLayout.bounds.size;
@@ -458,7 +472,7 @@
     NSString *characters = theEvent.characters;
     
     if ([characters isEqualToString:@"("]) {
-        [self insertParenthesisFunction];
+        [self insertParenthesisFunction:nil];
         return;
     }
     
@@ -466,7 +480,7 @@
     
     NSString *decimalSeparator = [NSRegularExpression escapedPatternForString:[[NSLocale currentLocale] objectForKey:NSLocaleDecimalSeparator]];
     NSMutableCharacterSet *allowedCharacters = [NSMutableCharacterSet alphanumericCharacterSet];
-    [allowedCharacters addCharactersInString:[NSString stringWithFormat:@"+-*= %@", decimalSeparator]];
+    [allowedCharacters addCharactersInString:[NSString stringWithFormat:@"+-*= !%@", decimalSeparator]];
     
     if (characters.length == 1 && [characters stringByTrimmingCharactersInSet:allowedCharacters].length == 0) {
         [self.expressionStorage replaceSymbolsInRangePath:self.selection withElements:@[characters]];
@@ -476,7 +490,7 @@
     }
 }
 
-- (void)insertParenthesisFunction
+- (void)insertParenthesisFunction:(id)sender
 {
     MPExpression *selectedElementsExpression = [self.expressionStorage subexpressionWithRangePath:self.selection];
     MPParenthesisFunction *function = [[MPParenthesisFunction alloc] init];
@@ -700,7 +714,7 @@
             MPExpression *newTargetExpression = [self.expressionStorage elementAtIndexPath:newTargetExpressionPath];
             NSIndexPath *newSelectionLocation = [functionPath indexPathByReplacingLastIndexWithIndex:[newTargetExpression locationOfElementAtIndex:functionPath.lastIndex]];
             
-            [self.expressionStorage replaceSymbolsInRangePath:MPMakeRangePath(functionPath, 1) withElements:remainder];
+            [self.expressionStorage replaceSymbolsInRangePath:MPMakeRangePath(newSelectionLocation, 1) withElements:remainder];
             self.selection = MPMakeRangePath(newSelectionLocation, 0);
         }
     }
diff --git a/MathPad/MPFunctionsViewController.m b/MathPad/MPFunctionsViewController.m
index 0cefe0e..098506e 100644
--- a/MathPad/MPFunctionsViewController.m
+++ b/MathPad/MPFunctionsViewController.m
@@ -14,11 +14,11 @@
 #import "MPParenthesisFunction.h"
 
 
-@class MPFunctionTemplatePrototype;
+@class MPFunctionTemplateItem;
 
 @interface MPFunctionsCollectionView : NSCollectionView
 
-@property (nonatomic, weak) MPFunctionTemplatePrototype *hoverItem;
+@property (nonatomic, weak) MPFunctionTemplateItem *hoverItem;
 
 @property (nonatomic, weak) id target;
 @property (nonatomic) SEL action;
@@ -37,7 +37,8 @@
 
 
 
-@interface MPFunctionTemplatePrototype : NSCollectionViewItem
+@interface MPFunctionTemplateItem : NSCollectionViewItem
+@property (nonatomic, copy) NSString *templateName;
 @end
 
 
@@ -56,7 +57,7 @@
         if (NSMouseInRect(pointInView, viewItem.view.frame, self.isFlipped)) {
             if (self.target && self.action) {
                 [self.target performSelector:self.action
-                                  withObject:[viewItem.representedObject copy]
+                                  withObject:[[viewItem.representedObject objectForKey:@"function" ] copy]
                                   afterDelay:0.0];
             }
             break;
@@ -103,6 +104,7 @@
 @synthesize functionTemplateLayout = _functionTemplateLayout;
 - (MPFunctionLayout *)functionTemplateLayout
 {
+    
     if (!_functionTemplateLayout) {
         _functionTemplateLayout = [MPFunctionLayout functionLayoutForFunction:self.functionTemplate
                                                                        parent:nil];
@@ -140,21 +142,13 @@
 
 
 
-@implementation MPFunctionTemplatePrototype
+@implementation MPFunctionTemplateItem
 
 static void *MPFunctionTemplateViewMouseOverContext = @"MPFunctionTemplateViewMouseOverContext";
 
-- (id)initWithCoder:(NSCoder *)aDecoder
+- (id)awakeAfterUsingCoder:(NSCoder *)aDecoder
 {
-    self = [super initWithCoder:aDecoder];
-    if (self) {
-        MPFunctionTemplateView *view = (MPFunctionTemplateView *)self.view;
-        [view addObserver:self
-               forKeyPath:@"mouseOver"
-                  options:0
-                  context:MPFunctionTemplateViewMouseOverContext];
-    }
-    return self;
+    return [super awakeAfterUsingCoder:aDecoder];
 }
 
 - (void)observeValueForKeyPath:(NSString *)keyPath
@@ -175,8 +169,14 @@ static void *MPFunctionTemplateViewMouseOverContext = @"MPFunctionTemplateViewMo
 
 - (void)setRepresentedObject:(id)representedObject
 {
+    MPFunctionTemplateView *view = (MPFunctionTemplateView *)self.view;
+    view.functionTemplate = [representedObject objectForKey:@"function"];
+    self.templateName = [representedObject objectForKey:@"name"];
+    [view addObserver:self
+           forKeyPath:@"mouseOver"
+              options:0
+              context:MPFunctionTemplateViewMouseOverContext];
     [super setRepresentedObject:representedObject];
-    ((MPFunctionTemplateView *)self.view).functionTemplate = representedObject;
 }
 
 @end
@@ -195,21 +195,14 @@ static void *MPFunctionTemplateViewMouseOverContext = @"MPFunctionTemplateViewMo
                           bundle:[NSBundle bundleForClass:[self class]]];
 }
 
-- (id)initWithNibName:(NSString *)nibNameOrNil
-               bundle:(NSBundle *)nibBundleOrNil
+- (void)awakeFromNib
 {
-    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
-    if (self) {
-        self.functionPrototypes = @[[[MPSumFunction alloc] init], [[MPParenthesisFunction alloc] init]];
-    }
-    return self;
-}
-
-static void *MPCollectionViewHoverItemChangeContext = @"MPCollectionViewHoverItemChangeContext";
-
-- (void)loadView
-{
-    [super loadView];
+    self.functionPrototypes = @[
+                                @{@"function": [[MPSumFunction alloc] init],
+                                  @"name": NSLocalizedString(@"Sum", @"Sum Function Name")},
+                                @{@"function": [[MPParenthesisFunction alloc] init],
+                                  @"name": NSLocalizedString(@"Parenthesis", @"Parenthesis Function Name")}
+                                ];
     [self.collectionView addObserver:self
                           forKeyPath:@"hoverItem"
                              options:0
@@ -218,6 +211,13 @@ static void *MPCollectionViewHoverItemChangeContext = @"MPCollectionViewHoverIte
     self.collectionView.action = self.action;
 }
 
+static void *MPCollectionViewHoverItemChangeContext = @"MPCollectionViewHoverItemChangeContext";
+
+- (void)setView:(NSView *)view
+{
+    [super setView:view];
+}
+
 - (void)setTarget:(id)target
 {
     _target = target;
@@ -240,7 +240,7 @@ static void *MPCollectionViewHoverItemChangeContext = @"MPCollectionViewHoverIte
                        context:(void *)context
 {
     if (context == MPCollectionViewHoverItemChangeContext) {
-        self.currentDescription = [[self.collectionView.hoverItem.representedObject class] performSelector:@selector(localizedFunctionName)];
+        self.currentDescription = self.collectionView.hoverItem.templateName;
     } else {
         [super observeValueForKeyPath:keyPath
                              ofObject:object
diff --git a/MathPad/MPFunctionsViewController.xib b/MathPad/MPFunctionsViewController.xib
index 9f5f5c0..da61fbd 100644
--- a/MathPad/MPFunctionsViewController.xib
+++ b/MathPad/MPFunctionsViewController.xib
@@ -69,7 +69,7 @@
             </constraints>
             <point key="canvasLocation" x="-101" y="140.5"/>
         </customView>
-        <collectionViewItem id="4Wf-e2-Nmy" customClass="MPFunctionTemplatePrototype">
+        <collectionViewItem id="4Wf-e2-Nmy" customClass="MPFunctionTemplateItem">
             <connections>
                 <outlet property="view" destination="dE9-Vu-psk" id="hX8-fz-7FR"/>
             </connections>