Added DockItem Header Sample.

Samples/DockItem Header/.vs/WpfApp1.csproj.dtbcache.json

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Samples/DockItem Header/.vs/WpfApp1/v17/DocumentLayout.backup.json

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Samples/DockItem Header/.vs/WpfApp1/v17/DocumentLayout.json

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Samples/DockItem Header/.vs/WpfApp2/v17/DocumentLayout.backup.json

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Samples/DockItem Header/.vs/WpfApp2/v17/DocumentLayout.json

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Samples/DockItem Header/WpfApp2.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35828.75 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WpfApp2", "WpfApp2\WpfApp2.csproj", "{09487682-923B-4B3C-92A8-B5ABDB8CEAB6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{09487682-923B-4B3C-92A8-B5ABDB8CEAB6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{09487682-923B-4B3C-92A8-B5ABDB8CEAB6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{09487682-923B-4B3C-92A8-B5ABDB8CEAB6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{09487682-923B-4B3C-92A8-B5ABDB8CEAB6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AC3D2B41-A055-42E3-9751-FF9C13B01145}
+	EndGlobalSection
+EndGlobal

Samples/DockItem Header/WpfApp2/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Samples/DockItem Header/WpfApp2/App.xaml

@@ -0,0 +1,11 @@
+<Application x:Class="WpfApp2.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:WpfApp2"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <DataTemplate x:Key="HeaderTemplate">
+            <local:CustomHeader/>
+        </DataTemplate>
+    </Application.Resources>
+</Application>

Samples/DockItem Header/WpfApp2/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace WpfApp2
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}