Added DockItem Header Sample.

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
+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

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+<?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

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+<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">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto" />
+                    <ColumnDefinition />
+                </Grid.ColumnDefinitions>
+                <Path
+                    x:Name="data"
+                    Width="{Binding IconSize.Width}"
+                    Height="{Binding IconSize.Height}"
+                    Margin="0,0,0,0"
+                    Data="{Binding IconData}"
+                    Fill="#FF000000"
+                    RenderTransformOrigin="0.5,0.5"
+                    Stretch="Uniform">
+                    <Path.RenderTransform>
+                        <TransformGroup>
+                            <TransformGroup.Children>
+                                <RotateTransform Angle="0" />
+                                <ScaleTransform ScaleX="1" ScaleY="1" />
+                            </TransformGroup.Children>
+                        </TransformGroup>
+                    </Path.RenderTransform>
+                </Path>
+                <TextBlock Grid.Column="1"
+                    Margin="3,0"
+                    VerticalAlignment="Center"
+                    Text="{Binding Title}" />
+            </Grid>
+        </DataTemplate>
+    </Application.Resources>
+</Application>

Samples/DockItem Header/WpfApp2/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 WpfApp2
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Samples/DockItem Header/WpfApp2/MainWindow.xaml

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+<Window x:Class="WpfApp2.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:WpfApp2" xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.DataContext>
+        <local:DockViewModel/>
+    </Window.DataContext>
+    <Grid>
+        <syncfusion:DockingManager x:Name="dockingManager" ItemsSource="{Binding DockItemCollection}">
+        </syncfusion:DockingManager>
+    </Grid>
+</Window>

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

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+using Syncfusion.Windows.Shared;
+using Syncfusion.Windows.Tools.Controls;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+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.Markup;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WpfApp2
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+
+    public class Header
+    {
+        public string Title { get; set; }
+
+        public Geometry IconData
+        {
+            get;set;
+        }
+
+        public Size IconSize { get; set; }
+    }
+
+    public class DockViewModel : NotificationObject
+    {
+        public DockViewModel()
+        {
+            GenerateDockItemCollection();
+        }
+        private ObservableCollection<DockItem> dockItems;
+
+        public ObservableCollection<DockItem> DockItemCollection
+        {
+            get { return dockItems; }
+            set { dockItems = value; this.RaisePropertyChanged(nameof(DockItemCollection)); }
+        }
+
+        private void GenerateDockItemCollection()
+        {
+            DockItemCollection = new ObservableCollection<DockItem>();
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "Toolbox", IconData = Geometry.Parse("M9.7000122,0L16.600006,1.6000004 11.100006,6.3999721 17.100006,13.099962 20.600006,9.5999738 20.5,9.3999626C20.299988,8.8999635 20.200012,8.2999603 20.200012,7.6999861 20.200012,4.4999849 22.799988,1.8999874 26,1.8999873 26.600006,1.8999874 27.100006,1.9999931 27.600006,2.0999989L24,3.8999805 24.600006,8.8999635 29.5,9.6999799 31.399994,6.0999858C31.899994,6.4999782 32,6.9999763 32,7.5999805 32,10.799952 29.399994,13.399949 26.200012,13.399949 25.299988,13.399949 24.399994,13.199968 23.700012,12.799945L23.600006,12.699969 20,16.299933 28.399994,25.699927 30.600006,28.099913C31.399994,28.999903 31.399994,30.399893 30.399994,31.299883 29.5,32.099898 28.100006,32.099898 27.200012,31.099901L26.5,30.299887 26.299988,30.099905 24.299988,27.899901C24.200012,27.799895,24.200012,27.799895,24.200012,27.699919L16.700012,19.399929 12.299988,23.699932 12.399994,23.899914C12.600006,24.499918 12.799988,25.199928 12.799988,25.899906 12.799988,29.099909 10.200012,31.699906 7,31.699906 6.3999939,31.699906 5.8999939,31.599901 5.3999939,31.499895L9,29.699913 8.3999939,24.69993 3.2999878,23.99992 1.3999939,27.599915C1.2000122,27.099915 1.2000122,26.499911 1.2000122,25.899906 1.2000122,22.699936 3.7999878,20.09994 7,20.09994 7.7999878,20.09994 8.6000061,20.299919 9.2999878,20.599938L9.3999939,20.699944 13.899994,16.299933 7.8999939,9.4999677 4,12.89995 0,8.5999777z") , IconSize = new Size(15,15) }, Name = "tool", State = DockState.Dock, DesiredWidthInDockedMode = 150, HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "MainWindow.xaml.cs" }, State = DockState.Document, HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "MainWindow.xaml", IconData = Geometry.Parse("M3.3169894,18.909973L3.3169894,20.480957 14.341993,20.480957 14.341993,18.909973z M3.3169894,12.10199L3.3169894,13.672974 19.114001,13.672974 19.114001,12.10199z M16.406999,1.1129761L21.374013,6.3989868 17.453996,6.3989868C16.875993,6.3989868,16.406999,5.9299927,16.406999,5.3519897z M2.2689838,0L14.893996,0 14.893996,5.6429443C14.893996,6.8959961,15.910995,7.9119873,17.163987,7.9119873L22.457999,7.9119873 22.457999,29.730957C22.457999,30.983948,21.442006,32,20.189015,32L2.2689838,32C1.0159922,32,4.4543413E-08,30.983948,0,29.730957L0,2.2689819C4.4543413E-08,1.0159912,1.0159922,0,2.2689838,0z"), IconSize = new Size(15,15) }, State = DockState.Document , HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "Properties", IconData = Geometry.Parse("M11.800031,24L31.799999,24 31.799999,32 11.800031,32z M0,24L7.999988,24 7.999988,32 0,32z M11.800031,12L31.799999,12 31.799999,20 11.800031,20z M0,12L7.999988,12 7.999988,20 0,20z M11.800031,0L31.799999,0 31.799999,8 11.800031,8z M0,0L7.999988,0 7.999988,8 0,8z"), IconSize = new Size(15, 15) }, Name = "Properties", State = DockState.Dock, SideInDockedMode = DockSide.Tabbed, TargetNameInDockedMode = "solution", HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "Solution Explorer" }, DesiredWidthInDockedMode = 150, Name = "solution", State = DockState.Dock, SideInDockedMode = DockSide.Right, HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = new Header { Title = "Warning", IconData = Geometry.Parse("M14.966003,22.147998L17.112,22.147998 17.112,24.293016 14.966003,24.293016z M14.874008,13.098992L17.195007,13.098992 17.195007,15.726005 16.645004,21.407031 15.432007,21.407031 14.874008,15.726005z M16,5.1690032L4.1110077,27.212022 27.889008,27.212022z M16,0L24,14.832999 32,29.666 16,29.666 0,29.666 8,14.832999z") , IconSize = new Size(15, 15) }, Name = "Output", DesiredHeightInDockedMode = 150, State = DockState.Dock, SideInDockedMode = DockSide.Bottom, HeaderTemplate = (DataTemplate)Application.Current.FindResource("HeaderTemplate") });
+
+            DockItemCollection.Add(new DockItem() { Header = "Error List", State = DockState.Dock, SideInDockedMode = DockSide.Tabbed, TargetNameInDockedMode = "Output"});
+
+            DockItemCollection.Add(new DockItem() { Header = "Find Results", State = DockState.Dock, SideInDockedMode = DockSide.Tabbed, TargetNameInDockedMode = "Output" });
+        }
+    }
+}

Samples/DockItem Header/WpfApp2/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("WpfApp2")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("WpfApp2")]
+[assembly: AssemblyCopyright("Copyright ©  2025")]
+[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
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]