Add project files.

Fate.Wpf.Controls.Tester/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.1" />
+    </startup>
+</configuration>

Fate.Wpf.Controls.Tester/App.xaml

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+<Application x:Class="Fate.Wpf.Controls.Tester.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Fate.Wpf.Controls.Tester"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Fate.Wpf.Controls.Tester/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Fate.Wpf.Controls.Tester
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Fate.Wpf.Controls.Tester/Fate.Wpf.Controls.Tester.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{76895FDD-2975-47D3-B3B6-490C09C9A7ED}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>Fate.Wpf.Controls.Tester</RootNamespace>
+    <AssemblyName>Fate.Wpf.Controls.Tester</AssemblyName>
+    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="Fate.Wpf.MVVM">
+      <HintPath>lib\Fate.Wpf.MVVM.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Page Include="MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="MainWindowViewModel.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Fate.Wpf.Controls\Fate.Wpf.Controls.csproj">
+      <Project>{7e9c7618-9941-4d31-8965-0e8b4d6b8004}</Project>
+      <Name>Fate.Wpf.Controls</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Fate.Wpf.Controls.Tester/MainWindow.xaml

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+<Window x:Class="Fate.Wpf.Controls.Tester.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Fate.Wpf.Controls.Tester"
+        xmlns:c="clr-namespace:Fate.Wpf.Controls;assembly=Fate.Wpf.Controls"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.Resources>
+        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
+    </Window.Resources>
+    <Window.DataContext>
+        <local:MainWindowViewModel/>
+    </Window.DataContext>
+
+    <Grid>
+        <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center" Width="200">
+            <Separator/>
+            <c:LabelTextBox Label="{Binding LabelText}" Value="{Binding LabelValueText}" Margin="3"/>
+            <Grid Width="100" Height="23" Margin="3">
+                <Button Content="LabelTextBox" Command="{Binding LabelTextBoxCommand}"/>
+                <Button Content="Cancel" Command="{Binding LabelTextBoxCommand.CancelCommand}" Visibility="{Binding LabelTextBoxCommand.Execution.IsNotCompleted, Converter={StaticResource BooleanToVisibilityConverter}, FallbackValue=Collapsed}"/>
+            </Grid>
+            <Separator/>
+            <c:LabelUnitTextBox Label="{Binding LabelUnitText}" Value="{Binding LabelUnitValueText}" Unit="{Binding LabelUnitUnitText}" UnitWidth="Auto" Margin="3"/>
+            <Grid Width="100" Height="23" Margin="3">
+                <Button Content="LabelUnitTextBox" Command="{Binding LabelUnitTextBoxCommand}"/>
+                <Button Content="Cancel" Command="{Binding LabelUnitTextBoxCommand.CancelCommand}" Visibility="{Binding LabelUnitTextBoxCommand.Execution.IsNotCompleted, Converter={StaticResource BooleanToVisibilityConverter}, FallbackValue=Collapsed}"/>
+            </Grid>
+        </StackPanel>
+    </Grid>
+</Window>

Fate.Wpf.Controls.Tester/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace Fate.Wpf.Controls.Tester
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

Fate.Wpf.Controls.Tester/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Fate.Wpf.MVVM;
+
+namespace Fate.Wpf.Controls.Tester
+{
+    public class MainWindowViewModel : PropertyChangedBase
+    {
+        private string _labelText;
+        private string _labelValueText;
+        private string _labelUnitText;
+        private string _labelUnitValueText;
+        private string _labelUnitUnitText;
+
+        public MainWindowViewModel()
+        {
+            WireCommands();
+        }
+
+        public string LabelText { get => _labelText; set => SetProperty(ref _labelText, value); }
+
+        public string LabelValueText { get => _labelValueText; set => SetProperty(ref _labelValueText, value); }
+
+        public string LabelUnitText { get => _labelUnitText; set => SetProperty(ref _labelUnitText, value); }
+
+        public string LabelUnitValueText { get => _labelUnitValueText; set => SetProperty(ref _labelUnitValueText, value); }
+
+        public string LabelUnitUnitText { get => _labelUnitUnitText; set => SetProperty(ref _labelUnitUnitText, value); }
+
+        public AsyncCommand<object> LabelTextBoxCommand { get; private set; }
+
+        public AsyncCommand<object> LabelUnitTextBoxCommand { get; private set; }
+
+        private void WireCommands()
+        {
+            LabelTextBoxCommand = AsyncCommand.Create(
+                async (token, param) =>
+                {
+                    LabelText = default(string);
+                    LabelValueText = default(string);
+                    await Task.Delay(1000, token);
+                    LabelText = "Hello";
+                    LabelValueText = "World!";
+                });
+
+            LabelUnitTextBoxCommand = AsyncCommand.Create(
+                async (token, param) =>
+                {
+                    LabelUnitText = default(string);
+                    LabelUnitValueText = default(string);
+                    LabelUnitUnitText = default(string);
+                    await Task.Delay(1000, token);
+                    LabelUnitText = "Hello";
+                    LabelUnitValueText = "World!";
+                    LabelUnitUnitText = "Alpha";
+                });
+        }
+    }
+}

Fate.Wpf.Controls.Tester/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Fate.Wpf.Controls.Tester")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Fate.Wpf.Controls.Tester")]
+[assembly: AssemblyCopyright("Copyright ©  2019")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+//In order to begin building localizable applications, set
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]
+
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]