Index: Core/Common/src/Core.Common.Gui/Forms/MainWindow/MainWindow.xaml
===================================================================
diff -u -r824bc2f71241ceb90d7bd1cd0e73b8581bd3eac5 -ra3863788feee5cf7ae74c959c0267879f6e2f8ec
--- Core/Common/src/Core.Common.Gui/Forms/MainWindow/MainWindow.xaml	(.../MainWindow.xaml)	(revision 824bc2f71241ceb90d7bd1cd0e73b8581bd3eac5)
+++ Core/Common/src/Core.Common.Gui/Forms/MainWindow/MainWindow.xaml	(.../MainWindow.xaml)	(revision a3863788feee5cf7ae74c959c0267879f6e2f8ec)
@@ -1,4 +1,4 @@
-<!--
+<!--
 Copyright (C) Stichting Deltares 2021. All rights reserved.
 
 This file is part of Riskeer.
@@ -73,6 +73,7 @@
                 </Style.Triggers>
             </Style>
             
+            <SolidColorBrush x:Key="ButtonBackground" Color="Transparent" />
             <SolidColorBrush x:Key="BorderBrush" Color="{StaticResource Transparent}" />
             <SolidColorBrush x:Key="MainButtonBarBottomBorderBrush" Color="{StaticResource DeltaresSand}" />
             <SolidColorBrush x:Key="MainButtonBarActiveBackgroundColor" Color="#F1F1EE" />
@@ -95,6 +96,67 @@
                     </DataTrigger>
                 </Style.Triggers>
             </Style>
+            
+            <Style x:Key="ButtonIconStyle" TargetType="{x:Type TextBlock}">
+                <Setter Property="FontSize" Value="32" />
+                <Setter Property="TextAlignment" Value="Center" />
+                <!-- <Setter Property="FontFamily" Value="{StaticResource Deltares}" /> -->
+            </Style>
+            
+            <Style x:Key="MainButtonBarButtonStyle" TargetType="ButtonBase">
+                <Setter Property="Padding" Value="0 6" />
+                <Setter Property="Margin" Value="3 6 " />
+                <Setter Property="MinWidth" Value="66" />
+                <Setter Property="Height" Value="85" />
+                <Setter Property="Background" Value="{StaticResource BorderBrush}" />
+                <Setter Property="BorderBrush" Value="{StaticResource ButtonBackground}" />
+                <Setter Property="Template">
+                    <Setter.Value>
+                        <ControlTemplate TargetType="{x:Type ButtonBase}">
+                            <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
+                                <Grid>
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="auto"/>
+                                        <RowDefinition Height="auto"/>
+                                    </Grid.RowDefinitions>
+                                    <ContentPresenter Grid.Row="0" HorizontalAlignment="Center"/>
+                                    <Label Grid.Row="1" Content="{Binding Path=Tag, RelativeSource={RelativeSource TemplatedParent}}"
+                                           HorizontalAlignment="Center" Foreground="{TemplateBinding Foreground}"/>
+                                </Grid>
+                            </Border>
+                            <ControlTemplate.Triggers>
+                                <Trigger Property="IsMouseOver" Value="True">
+                                    <Setter Property="Background" Value="#e4e4df" />
+                                    <Setter Property="BorderBrush" Value="#d2d2ca" />
+                                </Trigger>
+                                <Trigger Property="IsPressed" Value="True">
+                                    <Setter Property="Background" Value="#e4e4df" />
+                                    <Setter Property="BorderBrush" Value="#d2d2ca" />
+                                    <Setter Property="Foreground" Value="{StaticResource WindowTitleColorBrush}" />
+                                </Trigger>
+                            </ControlTemplate.Triggers>
+                        </ControlTemplate>
+                    </Setter.Value>
+                </Setter>
+            </Style>
+            
+            <Style x:Key="ToggleButtonStyle" TargetType="ToggleButton"
+                   BasedOn="{StaticResource MainButtonBarButtonStyle}">
+                <Style.Triggers>
+                    <Trigger Property="IsChecked" Value="True">
+                        <Setter Property="Background" Value="#e4e4df" />
+                        <Setter Property="BorderBrush" Value="#d2d2ca" />
+                        <Setter Property="Foreground" Value="{StaticResource WindowTitleColorBrush}" />
+                    </Trigger>
+                </Style.Triggers>
+            </Style>
+            
+            <Style x:Key="SeparatorStyle" TargetType="{x:Type Separator}"
+                   BasedOn="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}">
+                <Setter Property="Width" Value="1"/>
+                <Setter Property="Height" Value="88"/>
+                <Setter Property="Background" Value="{StaticResource MainButtonBarBottomBorderBrush}" />
+            </Style>
         </ResourceDictionary>
     </metro:MetroWindow.Resources>
     
@@ -138,7 +200,34 @@
     <Grid Background="{StaticResource BackgroundColorBrush}">
         <DockPanel>
             
-            <StackPanel DockPanel.Dock="Top" Height="100" Background="{StaticResource MainButtonBarActiveBackgroundColor}"/>
+            <StackPanel DockPanel.Dock="Top" Height="100" Background="{StaticResource MainButtonBarActiveBackgroundColor}" Orientation="Horizontal">
+                <Button Style="{StaticResource MainButtonBarButtonStyle}"
+                        Tag="Project">
+                    <TextBlock Style="{StaticResource ButtonIconStyle}"
+                               Text="1"/>
+                </Button>
+                <Separator Style="{StaticResource SeparatorStyle}" />
+                <ToggleButton Style="{StaticResource ToggleButtonStyle}"
+                              Tag="Traject">
+                    <TextBlock Style="{StaticResource ButtonIconStyle}"
+                               Text="2"/>
+                </ToggleButton>
+                <ToggleButton Style="{StaticResource ToggleButtonStyle}"
+                              Tag="Faalpaden">
+                    <TextBlock Style="{StaticResource ButtonIconStyle}"
+                               Text="3"/>
+                </ToggleButton>
+                <ToggleButton Style="{StaticResource ToggleButtonStyle}"
+                              Tag="Berekeningen">
+                    <TextBlock Style="{StaticResource ButtonIconStyle}"
+                               Text="4"/>
+                </ToggleButton>
+                <ToggleButton Style="{StaticResource ToggleButtonStyle}"
+                              Tag="Assembleren">
+                    <TextBlock Style="{StaticResource ButtonIconStyle}"
+                               Text="5"/>
+                </ToggleButton>
+            </StackPanel>
             
             <Border DockPanel.Dock="Top"
                     BorderThickness="0,1,0,0"