MacOS (#650)

* [MacOS] Add SwitchRenderer

* [MacOS] Add TimePickerRenderer

* [MacOS] Cleanup TimePcikerRender

* [MacOS] Add WebViewRenderer

* [MacOS] Add Javascript evaluate to webview

* [MacOS] Fix build error on WebViewRenderer

* [MacOS] Add Base and TextCell renderers

* [MacOS] Start on ListViewRenderer

* [MacOS] Cleanup

* [MacOS] Vertical center text on default NSTextField

* [MacOS] Center NSTextField vertically

* [MacOS] Add ImageCellRenderer

* [MacOS] Add SwitchCellRenderer

* [MacOS] Add SwitchCellRenderer

* [iOS] Allow to set background color on other CellRenderers

* [MacOS] Fix selection mode on ListView

* [MacOS] Set background on Entry of entry cell

* [MacOS] Fix casting bug on CellRenderer

* [MacOS] Other fix on CellRenderer background

* [MacOS] Add ViewCellRenderer

* [MacOS] Fixes and cleanup on cells

* [MacOS] Add NSScrollView so NSTableView can scroll

* [MacOS] Add HeaderView to ListView

* [MacOS] Cleanup

* [Controls] Add Header support to ListView

* [MacOS] NSView reuse on NSTableView

* [MacOS] Some fix on layour order

* [MacOS] Add CarouselPageRenderer

* [MacOS] Implement EventTracker on PageRenderer

* [MacOS] Cleanup CarouselPageRenderer

* [MacOS] Add MasterDetailPage renderer

* [MacOS] MDP renderer don't allow drag of splitter

* [MacOS] Add TabbedPage renderer

* [MacOS] Initial sketch of NavigationPageRenderer

* [MacOS] Send disappearing of CurrentPage on Dispose on NavigationPageRenderer

* [MacOS] Add Gallery page for Mac

* [MacOS] Add MacOSExpressionSearch

* [MacOS] Fix ColorExtension

* [MacOS] Fix MDP renderer layout

* [MacOS] Implement native selection on ListViewRenderer

* [MacOS] Deselect a item on NSTableView

* [MacOS] Remove previous SplitViewItems

* [MacOS] Fix navigationpage height

* [MacOS] Add toolbar for NavigationPageRenderer

* [MacOS] Don't remove selection for now (crashing)

* [MacOS] Refactor page and back button title on NavigationPageRenderer

* [MacOS] Fix bug when native navigate back

* [MacOS] Hide layer when transition

* [MacOS] ListviewRenderer fix BbackgroundColor

* [MacOS] Fix background on ScrollViewRenderer

* [MacOS] Fix header measure on ListViewRenderer

* [MacOS] Add Mac twitter demo

* [Controls] Spaces for easy reading

* [MacOS] More xaml cleanup

* [Core] Add Mac as aTargetPlatform

* [MacOS] Add alerts and actionsheets

* [MacOS] Add GestureRecognizers

* [MacOS] Fix Layout issues when adding children, enable transformations

* [MacOS] Fix title on tab item, move to tabbed navigation based on segmented control

* [MacOS] Hide toolbar when not needed, this allows to work with tabbed page, cleanup

* [MacOS] Add NativeBindings and NativeViewWrapper

* [MacOS] Fix AssemblyInfo

* [MacOS] FIX NRE on SetBackgroundColor BoxView

* [MacOS] Fix NavigationPageRenderer

* [MacOS] Fix build

* [MacOS] Also update page when it resizes

* [MacOS] Add LayoutRenderer for handle items position when the bounds change.

* [MacOS] Refactor/Cleanup

* [MacOS] Add toolbar items support to NavigationPage

* [MacOS] Resize images for TabViewITems

* [MacOS] Fix TabbedPage resize issues , allow users to override some features when creating TVI

* [MacOS] Fix hide/show Navigation toolbar

* [MacOS] Redo CarouselPageRenderer with NSPageController

* [MacOS] Add support for Modal pages

* [MacOS] Refactor navigation from platform

* [Nuget] Add nuget for MacOS

* [Nuget]Fix nuspec

* [Nuget] Add variables for CI

* [Controls] Remove MainMenu from MacOS

* [MacOS] Add TableView renderer (no headers yet)

* [MacOS] Refactoring, marking extensions as internal

* [MacOS] Add group headers for TableViewRenderer

* [MacOS] Workaround for updates on listview collection

* [MacOS] Handle updates of rows in the ListViewRenderer properly

* [MacOS] Fix navigation animation

* Fix navigation header issues with modal pages

* [MacOS] Fix MDP issues with resizing

* [MacOS] Fix general dispose

* [MacOS] Add a ViewControllerWrapper for NSSplitView

* [MacOS] MDP renderer fix animation

* [MacOS] Fix ListView selection bug

* [MacOS] Fix rendering MDP Layout inside wrappers

* [MacOS] Re write the MainToolbar handler

* [MacOS] Don't use Sierra new extensions so we can run in stable channel

* [MacOS] Another way to hide the toolbar (smarter i think)

* [MacOS] Fix MDP bug and remove debug color

* [Controls] Add HanselForms sample

* [MacOS] Fix NRE WebviewRenderer

* [MacOS] Fix uneven rows on ListView renderer

* [MacOS] Fix NRE on load (can+t find the reason this happens)

* [MacOS] Fix uneven rows

* [MacOS] Fix header sizing on ListViewRenderer

* [Controls] More stuff on HanselForms

* [MacOS] Remove warning from ListViewRenderer

* [MacOS] Fix PageRenderer bug double init

* [MacOS] Don't calculate height if RowHeight is provided

* [Controls] More Hanselforms stuff

* [MacOS] Once again a new implementation for the NavigationBar, this time using a custom view to support BackgroundColor

* [MacOS] Fix build

* [MacOS] Refactoring AwesomeBar related controls

* Fix build

* [MacOS] NavigationBar update background and t test colors

* [MacOS] Fix when we remove navigation so it works when the NavigationRenderer wasn't removed from the parent controller like in a TabbedPage

* [MacOS] Add support for ListView  grouping

* [MacOS] Fix image extension method.

* [MacOS] Add base Maps project

* [MacOS] Export MapRenderer

* [MacOS] Add pin click and geocoderbacked for Maps

* [MacOS] Add extra binding project for API not in stable.

* [MacOS] Add MacOS Maps lib

* [MacOS]Fix build on alpha

* [MacOS] Remove MacOS Maps extra binding

* [UITest] Basic macOS setup

* [UITest] Add MacOSApp wrapper implementation

* [MacOS] Set AutomationID

* [UITests] Add ActionSheetUITests to MacOS UITest

* [MacOS] Fix bug on Picker

* [UITests] Link basic uitest basefixture and related files

* [MacOS] Fix pickers reuse

* [UItests] Fix MacOS app path

* [UITest] Ignore UItest for appearing on macOS for now

* [UITest] Update macOS for 2.0.3

* [UITest] Refactor EnterText MacOS app

* [UITest]Fix ViewQuery on MacOS

* [UITest]Fix IsEnabled UItest on macOS

* [UITest] Implement Enter, mark some tests inconclusive fix others

* [MacOS] Implement Entry Completed event

* [UITests] Fix UITest for IsVisible, ignore ToolbarItem test for now

* [UITests] Fix ISVisible again add extra category

* [Controls] Cleanup macOS gallery

* [MacOS] Fix Assembly info

* [Docs] Fix docs

* Fix build

* [Nuget] Fix nuspec

* [Controls] Link files on MacOS

* [Core] Update Forms stack before firing a event saying page was removed, possible breaking change

* [MacOS] Implement RemovePage on NavigationPAgeRenderer

* [UItest] Ignore some , implement back on MacOS UITest app

* [MacOS] Add default back button name (needs to be translated)

* [MacOS] Fix dispose

* [UITest] Make 29257 work on MacOS

* [MacOS] Rename stuff

* [MacOS] More renaming and cleanup

* [MacOS] Share implementations for iOS

* [MacOS] Reuse more IOS extensions

* [MacOS] Reuse FontExtensions

* [MacOS] Share NativeViewWrapper related stuff

* [MAcOS] Share event args and ExportRenderer

* [MacOS] Share platform effect

* [MacOS] Fix build

* [Docs]Fixing docs

* [MacOS] Fix ViewCell reuse

* [Core] Support ListView CachingStrategy on MacOS

* [MacOS] Fix issues with TextCell and ImageCell (we can’t set null to a NSControl value)

* [MacOS] Fix MDP child sizing bug
[UITest] Query marked by id and text

* [MacOS] Comment test related with context actions

* [MacOS] Implement missing stuff on ticker

* [MacOS] Make sure VisualElemenTracker calls the ticker update

* [UITests]Ignore context actions and not possible to test

* [MacOS] Fix Grouping bug on Listview

* [MacOS] Fix selection on Listview when using grouping

* [MacOS] Update navbar when page is popped

* [MacOS] Cleanup NavigationBar

* [Controls] More info on exceptions

* [MacOS] Fix bug animation pop modal

* [MacOS] Bring back BackgroundColor of NavigationBar

* [MacOS] Fix UITest animation delay

* [MacOS] Treat warnings as errors

* [MacOS] Center title on toolbar

* [Core] Add Platform configuration specific for MacOS

* [MacOS] Implement TabbedPage platform specific to handle TabItems on NavigationPage bar

* [MacOS] Fix warning

* [MacOS] Fix bug on SearchBar color

* [MacOS]Fix build

* [MacOS] remove extra dll from maps

* [Docs] Update docs

* [MacOS]Cleanup and refactoring

* Revert "[MacOS] remove extra dll from maps"

This reverts commit 73b948937001fea3f28449a963d0b94943e07aa0.

* [MacOS] Fix wrong refactoring

* [MacOS] Remove gallery and uitest project

* [MacOS] dix formatting

* [MacOS] Remove extra stuff

* Merge branch 'master' into macOS-gallery

* [MacOS] Fix rebase

* [MacOS] Fix TargetPlatform

* fix docs

* [MacOS] Fix bug on TabbedPageRenderer no title

* [MacOS] Remove FormsNSView

* [MacOS] Cleanup on dispose on MDP renderer

* [MacOS] Update current page when source changes

* [MacOS] More cleanup

* [MacOS] Make sure we show the previous page when popping a Modal

* [MacOS] Fix issue with sizing the Header and visibility, remove for now header renderer reuse

* [MacOS] Clean CustomNSTableView

* [MacOS] Share LabelRenderer with iOS

* [MacOS] Share ResourcesProvider with iOS

* [MAcoS] Share VisualElementPackager with iOS

* [MacOS] Share ViewRenderer with iOS

* [MacOS] Merge with VisualElementTracker from iOS

* [MacOS] Merge with EventTracker from iOS

* [MacOS] Merge with VisualElementRenderer of iOS

* [MacOS] Make sure we always have a layer

* [MacOS] Fix Tracker merge with iOS version

* [MacOS] Fix bug with tabbed page on modal without navigation

* [Core] Rever change on core

* [MacOS] Clear renderers before setting them MDP

* [MacOS] Update tabbedPage ContainerArea

* [MacOS] Fix ListViewRenderer

* [MacOS] Make sure we don’t pass null to TextField string value

* [MacOS] Support for multiple clicks in same selected item on NSTableView

* [MacOS] Support Focus on EntryRenderer

* [MacOS] Fix index bug on TablevIewDataSource

* [MacOS] Fix SelectedItem TableViewDataSource

* [Nuget] Add Mac to Maps nuspec

* [Nuget]Fix path

* [macOS] Fixed Tab NSImage crash in TabbedPageRenderer (#705)

* [macOS] Fixed Tab NSImage crash in TabbedPageRenderer

* Coding Style

* Coding Style

* [MacOS] Fix previous merge with master

* [MacOS] Possible simple fix for click on views overlapping

* [MacOS] Rename to IsOnViewCell

* [MacOS] Cleanup, Address feedback from Samantha’s review

1 files changed, 429 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.MacOS/NativeToolbarTracker.cs b/Xamarin.Forms.Platform.MacOS/NativeToolbarTracker.cs
new file mode 100644
index 00000000..826b5b73
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/NativeToolbarTracker.cs
@@ -0,0 +1,429 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using AppKit;
+using CoreGraphics;
+using Xamarin.Forms.Internals;
+using Xamarin.Forms.PlatformConfiguration.macOSSpecific;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	class NativeToolbarGroup
+	{
+		public class Item
+		{
+			public NSToolbarItem ToolbarItem;
+			public NSButton Button;
+		}
+
+		public NativeToolbarGroup(NSToolbarItemGroup itemGroup)
+		{
+			Group = itemGroup;
+			Items = new List<Item>();
+		}
+
+		public NSToolbarItemGroup Group { get; }
+
+		public List<Item> Items { get; }
+	}
+
+	internal class NativeToolbarTracker : NSToolbarDelegate
+	{
+		const string ToolBarId = "AwesomeBarToolbar";
+
+		INavigationPageController NavigationController => _navigation;
+
+		readonly string _defaultBackButtonTitle = "Back";
+		readonly ToolbarTracker _toolbarTracker;
+
+		NSToolbar _toolbar;
+		NavigationPage _navigation;
+
+		bool _hasTabs;
+
+		const double BackButtonItemWidth = 36;
+		const double ToolbarItemWidth = 44;
+		const double ToolbarItemHeight = 25;
+		const double ToolbarItemSpacing = 6;
+		const double ToolbarHeight = 30;
+		const double NavigationTitleMinSize = 300;
+
+		const string NavigationGroupIdentifier = "NavigationGroup";
+		const string TabbedGroupIdentifier = "TabbedGroup";
+		const string ToolbarItemsGroupIdentifier = "ToolbarGroup";
+		const string TitleGroupIdentifier = "TitleGroup";
+
+		NativeToolbarGroup _navigationGroup;
+		NativeToolbarGroup _tabbedGroup;
+		NativeToolbarGroup _toolbarGroup;
+		NativeToolbarGroup _titleGroup;
+
+		NSView _nsToolbarItemViewer;
+
+		public NativeToolbarTracker()
+		{
+			_toolbarTracker = new ToolbarTracker();
+			_toolbarTracker.CollectionChanged += ToolbarTrackerOnCollectionChanged;
+		}
+
+		public NavigationPage Navigation
+		{
+			get { return _navigation; }
+			set
+			{
+				if (_navigation == value)
+					return;
+
+				if (_navigation != null)
+					_navigation.PropertyChanged -= NavigationPagePropertyChanged;
+
+				_navigation = value;
+
+				if (_navigation != null)
+				{
+					var parentTabbedPage = _navigation.Parent as TabbedPage;
+					if (parentTabbedPage != null)
+					{
+						_hasTabs = parentTabbedPage.OnThisPlatform().GetTabsStyle() == TabsStyle.OnNavigation;
+					}
+					_toolbarTracker.Target = _navigation.CurrentPage;
+					_navigation.PropertyChanged += NavigationPagePropertyChanged;
+				}
+
+				UpdateToolBar();
+			}
+		}
+
+		public void TryHide(NavigationPage navPage = null)
+		{
+			if (navPage == null || navPage == _navigation)
+			{
+				Navigation = null;
+			}
+		}
+
+		public override string[] AllowedItemIdentifiers(NSToolbar toolbar)
+		{
+			return new string[] { };
+		}
+
+		public override string[] DefaultItemIdentifiers(NSToolbar toolbar)
+		{
+			return new string[] { };
+		}
+
+		public override NSToolbarItem WillInsertItem(NSToolbar toolbar, string itemIdentifier, bool willBeInserted)
+		{
+			var group = new NSToolbarItemGroup(itemIdentifier);
+			var view = new NSView();
+			group.View = view;
+
+			if (itemIdentifier == NavigationGroupIdentifier)
+				_navigationGroup = new NativeToolbarGroup(group);
+			else if (itemIdentifier == TitleGroupIdentifier)
+				_titleGroup = new NativeToolbarGroup(group);
+			else if (itemIdentifier == TabbedGroupIdentifier)
+				_tabbedGroup = new NativeToolbarGroup(group);
+			else if (itemIdentifier == ToolbarItemsGroupIdentifier)
+				_toolbarGroup = new NativeToolbarGroup(group);
+
+			return group;
+		}
+
+		protected virtual bool HasTabs => _hasTabs;
+
+		protected virtual NSToolbar ConfigureToolbar()
+		{
+			var toolbar = new NSToolbar(ToolBarId)
+			{
+				DisplayMode = NSToolbarDisplayMode.Icon,
+				AllowsUserCustomization = false,
+				ShowsBaselineSeparator = true,
+				SizeMode = NSToolbarSizeMode.Regular,
+				Delegate = this
+			};
+
+			return toolbar;
+		}
+
+		internal void UpdateToolBar()
+		{
+			if (NSApplication.SharedApplication.MainWindow == null)
+				return;
+
+			if (NavigationController == null)
+			{
+				if (_toolbar != null)
+					_toolbar.Visible = false;
+				_toolbar = null;
+				return;
+			}
+
+			var currentPage = NavigationController.Peek();
+
+			if (NavigationPage.GetHasNavigationBar(currentPage))
+			{
+				if (_toolbar == null)
+				{
+					_toolbar = ConfigureToolbar();
+					NSApplication.SharedApplication.MainWindow.Toolbar = _toolbar;
+
+					_toolbar.InsertItem(NavigationGroupIdentifier, 0);
+					_toolbar.InsertItem(
+						HasTabs ? NSToolbar.NSToolbarSpaceItemIdentifier : NSToolbar.NSToolbarFlexibleSpaceItemIdentifier, 1);
+					_toolbar.InsertItem(HasTabs ? TabbedGroupIdentifier : TitleGroupIdentifier, 2);
+					_toolbar.InsertItem(NSToolbar.NSToolbarFlexibleSpaceItemIdentifier, 3);
+					_toolbar.InsertItem(ToolbarItemsGroupIdentifier, 4);
+				}
+
+				_toolbar.Visible = true;
+				UpdateToolbarItems();
+				UpdateTitle();
+				UpdateNavigationItems();
+				if (HasTabs)
+					UpdateTabbedItems();
+				UpdateBarBackgroundColor();
+			}
+			else
+			{
+				if (_toolbar != null)
+				{
+					_toolbar.Visible = false;
+				}
+			}
+		}
+
+		void UpdateBarBackgroundColor()
+		{
+			var bgColor = GetBackgroundColor().CGColor;
+
+			if (_nsToolbarItemViewer?.Superview?.Superview == null ||
+				_nsToolbarItemViewer.Superview.Superview.Superview == null) return;
+			// NSTitlebarView
+			_nsToolbarItemViewer.Superview.Superview.Superview.WantsLayer = true;
+			_nsToolbarItemViewer.Superview.Superview.Superview.Layer.BackgroundColor = bgColor;
+		}
+
+		void NavigationPagePropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
+		{
+			if (e.PropertyName.Equals(NavigationPage.BarTextColorProperty.PropertyName) ||
+				e.PropertyName.Equals(NavigationPage.BarBackgroundColorProperty.PropertyName))
+				UpdateToolBar();
+		}
+
+		void ToolbarTrackerOnCollectionChanged(object sender, EventArgs eventArgs)
+		{
+			UpdateToolbarItems();
+		}
+
+		async Task NavigateBackFrombackButton()
+		{
+			var popAsyncInner = NavigationController?.PopAsyncInner(true, true);
+			if (popAsyncInner != null)
+				await popAsyncInner;
+		}
+
+		bool ShowBackButton()
+		{
+			if (_navigation == null)
+				return false;
+
+			return NavigationPage.GetHasBackButton(_navigation.CurrentPage) && !IsRootPage();
+		}
+
+		bool IsRootPage()
+		{
+			if (NavigationController == null)
+				return true;
+			return NavigationController.StackDepth <= 1;
+		}
+
+		NSColor GetBackgroundColor()
+		{
+			var backgroundNSColor = NSColor.Clear;
+			if (Navigation != null && Navigation.BarBackgroundColor != Color.Default)
+				backgroundNSColor = Navigation.BarBackgroundColor.ToNSColor();
+			return backgroundNSColor;
+		}
+
+		NSColor GetTitleColor()
+		{
+			var titleNSColor = NSColor.Black;
+			if (Navigation != null && Navigation?.BarTextColor != Color.Default)
+				titleNSColor = Navigation.BarTextColor.ToNSColor();
+
+			return titleNSColor;
+		}
+
+		string GetCurrentPageTitle()
+		{
+			if (NavigationController == null)
+				return string.Empty;
+			return NavigationController.Peek().Title ?? "";
+		}
+
+		string GetPreviousPageTitle()
+		{
+			if (NavigationController == null || NavigationController.StackDepth <= 1)
+				return string.Empty;
+
+			return NavigationController.Peek(1).Title ?? _defaultBackButtonTitle;
+		}
+
+		List<ToolbarItem> GetToolbarItems()
+		{
+			return _toolbarTracker.ToolbarItems.ToList();
+		}
+
+		void UpdateTitle()
+		{
+			if (_toolbar == null || _navigation == null || _titleGroup == null)
+				return;
+
+			var title = GetCurrentPageTitle();
+			var item = new NSToolbarItem(title);
+			var view = new NSView();
+			var titleField = new NSTextField
+			{
+				AllowsEditingTextAttributes = true,
+				Bordered = false,
+				DrawsBackground = false,
+				Bezeled = false,
+				Editable = false,
+				Selectable = false,
+				Cell = new VerticallyCenteredTextFieldCell(0f, NSFont.TitleBarFontOfSize(18)),
+				StringValue = title
+			};
+			titleField.Cell.TextColor = GetTitleColor();
+			titleField.SizeToFit();
+			_titleGroup.Group.MinSize = new CGSize(NavigationTitleMinSize, ToolbarHeight);
+			_titleGroup.Group.Subitems = new NSToolbarItem[] { item };
+			view.AddSubview(titleField);
+			_titleGroup.Group.View = view;
+			//save a reference so we can paint this for the background
+			_nsToolbarItemViewer = _titleGroup.Group.View.Superview;
+			//position is hard .. we manually set the title to be centered 
+			var totalWidth = _titleGroup.Group.View.Superview.Superview.Frame.Width;
+			var fieldWidth = titleField.Frame.Width;
+			var x = ((totalWidth - fieldWidth) / 2) - _nsToolbarItemViewer.Frame.X;
+			titleField.Frame = new CGRect(x, 0, fieldWidth, ToolbarHeight);
+		}
+
+		void UpdateToolbarItems()
+		{
+			if (_toolbar == null || _navigation == null || _toolbarGroup == null)
+				return;
+
+			var currentPage = NavigationController.Peek();
+			UpdateGroup(_toolbarGroup, currentPage.ToolbarItems, ToolbarItemWidth, ToolbarItemSpacing);
+		}
+
+		void UpdateNavigationItems()
+		{
+			if (_toolbar == null || _navigation == null || _navigationGroup == null)
+				return;
+			var items = new List<ToolbarItem>();
+			if (ShowBackButton())
+			{
+				var backButtonItem = new ToolbarItem
+				{
+					Text = GetPreviousPageTitle(),
+					Command = new Command(async () => await NavigateBackFrombackButton())
+				};
+				items.Add(backButtonItem);
+			}
+
+			UpdateGroup(_navigationGroup, items, BackButtonItemWidth, -1);
+
+			var navItemBack = _navigationGroup.Items.FirstOrDefault();
+			if (navItemBack != null)
+			{
+				navItemBack.Button.Image = NSImage.ImageNamed(NSImageName.GoLeftTemplate);
+				navItemBack.Button.SizeToFit();
+				navItemBack.Button.AccessibilityTitle = "NSBackButton";
+			}
+		}
+
+		void UpdateTabbedItems()
+		{
+			if (_toolbar == null || _navigation == null || _tabbedGroup == null)
+				return;
+
+			var items = new List<ToolbarItem>();
+
+			var tabbedPage = _navigation.Parent as TabbedPage;
+			if (tabbedPage != null)
+			{
+				foreach (var item in tabbedPage.Children)
+				{
+					var tbI = new ToolbarItem
+					{
+						Text = item.Title,
+						Icon = item.Icon,
+						Command = new Command(() => tabbedPage.SelectedItem = item)
+					};
+					items.Add(tbI);
+				}
+			}
+
+			UpdateGroup(_tabbedGroup, items, ToolbarItemWidth, ToolbarItemSpacing);
+		}
+
+		static void UpdateGroup(NativeToolbarGroup group, IList<ToolbarItem> toolbarItems, double itemWidth,
+			double itemSpacing)
+		{
+			int count = toolbarItems.Count;
+			group.Items.Clear();
+			if (count > 0)
+			{
+				var subItems = new NSToolbarItem[count];
+				var view = new NSView();
+				nfloat totalWidth = 0;
+				var currentX = 0.0;
+				for (int i = 0; i < toolbarItems.Count; i++)
+				{
+					var element = toolbarItems[i];
+
+					var item = new NSToolbarItem(element.Text);
+					item.Activated += (sender, e) => (element as IMenuItemController).Activate();
+
+					var button = new NSButton();
+					button.Title = element.Text;
+					button.SizeToFit();
+					var buttonWidth = itemWidth;
+					if (button.FittingSize.Width > itemWidth)
+					{
+						buttonWidth = button.FittingSize.Width + 10;
+					}
+					button.Frame = new CGRect(currentX + i * itemSpacing, 0, buttonWidth, ToolbarItemHeight);
+					currentX += buttonWidth;
+					totalWidth += button.Frame.Width;
+					button.Activated += (sender, e) => (element as IMenuItemController).Activate();
+
+					button.BezelStyle = NSBezelStyle.TexturedRounded;
+					if (!string.IsNullOrEmpty(element.Icon))
+						button.Image = new NSImage(element.Icon);
+
+					button.SizeToFit();
+					view.AddSubview(button);
+
+					item.Label = item.PaletteLabel = item.ToolTip = button.ToolTip = element.Text;
+
+					subItems[i] = item;
+
+					group.Items.Add(new NativeToolbarGroup.Item { ToolbarItem = item, Button = button });
+				}
+				view.Frame = new CGRect(0, 0, totalWidth + (itemSpacing * (count - 1)), ToolbarItemHeight);
+
+				group.Group.Subitems = subItems;
+				group.Group.View = view;
+			}
+			else
+			{
+				group.Group.Subitems = new NSToolbarItem[] { };
+				group.Group.View = new NSView();
+			}
+		}
+	}
+}
\ No newline at end of file