Index: Core/Gui/src/Core.Gui/Forms/ViewHost/AvalonDockViewHost.xaml
===================================================================
diff -u -rb0b7cbccc0c3e51a0a19697aa10f9e622e8fe400 -r06d6b96a642d42ae2165417c3ffebceebb7a5612
--- Core/Gui/src/Core.Gui/Forms/ViewHost/AvalonDockViewHost.xaml	(.../AvalonDockViewHost.xaml)	(revision b0b7cbccc0c3e51a0a19697aa10f9e622e8fe400)
+++ Core/Gui/src/Core.Gui/Forms/ViewHost/AvalonDockViewHost.xaml	(.../AvalonDockViewHost.xaml)	(revision 06d6b96a642d42ae2165417c3ffebceebb7a5612)
@@ -59,6 +59,7 @@
                     <DockPanel d:DataContext="{d:DesignInstance viewHost:CustomLayoutAnchorable}">
                         <TextBlock Style="{StaticResource ButtonIconStyle}"
                                    Text="{Binding Symbol}"
+                                   FontFamily="{Binding FontFamily}"
                                    Margin="0,0,4,0"
                                    FontSize="24"/>
                         <TextBlock Text="{Binding Title}" VerticalAlignment="Center" TextTrimming="CharacterEllipsis"/>
Index: Core/Gui/src/Core.Gui/Forms/ViewHost/CustomLayoutAnchorable.cs
===================================================================
diff -u -rd6b7ed144b128f034c3a8d18671e42aae9eacc3e -r06d6b96a642d42ae2165417c3ffebceebb7a5612
--- Core/Gui/src/Core.Gui/Forms/ViewHost/CustomLayoutAnchorable.cs	(.../CustomLayoutAnchorable.cs)	(revision d6b7ed144b128f034c3a8d18671e42aae9eacc3e)
+++ Core/Gui/src/Core.Gui/Forms/ViewHost/CustomLayoutAnchorable.cs	(.../CustomLayoutAnchorable.cs)	(revision 06d6b96a642d42ae2165417c3ffebceebb7a5612)
@@ -20,6 +20,7 @@
 // All rights reserved.
 
 using System.Windows;
+using System.Windows.Media;
 using Xceed.Wpf.AvalonDock.Layout;
 
 namespace Core.Gui.Forms.ViewHost
@@ -36,12 +37,27 @@
             "Symbol", typeof(string), typeof(CustomLayoutAnchorable), new PropertyMetadata(default(string)));
 
         /// <summary>
+        /// The font family <see cref="DependencyProperty"/>.
+        /// </summary>
+        public static readonly DependencyProperty FontFamilyProperty = DependencyProperty.Register(
+            "FontFamily", typeof(FontFamily), typeof(CustomLayoutDocument), new PropertyMetadata(default(FontFamily)));
+
+        /// <summary>
         /// Gets or sets the symbol.
         /// </summary>
         public string Symbol
         {
             get => (string) GetValue(SymbolProperty);
             set => SetValue(SymbolProperty, value);
         }
+
+        /// <summary>
+        /// Gets or sets the font family of the symbol.
+        /// </summary>
+        public FontFamily FontFamily
+        {
+            get => (FontFamily) GetValue(FontFamilyProperty);
+            set => SetValue(FontFamilyProperty, value);
+        }
     }
 }
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/ViewHost/CustomLayoutAnchorableTest.cs
===================================================================
diff -u -rabdbd8693fa86216902285daf0c313e89fb43e4a -r06d6b96a642d42ae2165417c3ffebceebb7a5612
--- Core/Gui/test/Core.Gui.Test/Forms/ViewHost/CustomLayoutAnchorableTest.cs	(.../CustomLayoutAnchorableTest.cs)	(revision abdbd8693fa86216902285daf0c313e89fb43e4a)
+++ Core/Gui/test/Core.Gui.Test/Forms/ViewHost/CustomLayoutAnchorableTest.cs	(.../CustomLayoutAnchorableTest.cs)	(revision 06d6b96a642d42ae2165417c3ffebceebb7a5612)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Windows.Media;
 using Core.Gui.Forms.ViewHost;
 using NUnit.Framework;
 using Xceed.Wpf.AvalonDock.Layout;
@@ -33,16 +34,19 @@
         {
             // Setup
             const string symbol = "123";
+            var fontFamily = new FontFamily();
 
             // Call
             var layoutAnchorable = new CustomLayoutAnchorable
             {
-                Symbol = symbol
+                Symbol = symbol,
+                FontFamily = fontFamily
             };
 
             // Assert
             Assert.IsInstanceOf<LayoutAnchorable>(layoutAnchorable);
             Assert.AreEqual(symbol, layoutAnchorable.Symbol);
+            Assert.AreSame(fontFamily, layoutAnchorable.FontFamily);
         }
     }
 }
\ No newline at end of file