MainWindow.xaml

<Window x:Class="WpfFluentControls.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:WpfFluentControls"
        mc:Ignorable="d"
        Title="MainWindow" Height="600" Width="1000">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="240"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Border Background="{DynamicResource SubtleFillColorSecondaryBrush}" CornerRadius="0 12 0 0" >
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="*" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                
                <!-- ListView for Navigation -->
                <ListView x:Name="NavigationList" SelectionChanged="NavigationList_SelectionChanged" DockPanel.Dock="Top">
                    <ListViewItem Tag="GridSplitterPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[Complete]" />
                            <Run Text="GridSplitter" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="ThumbPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[Complete]" />
                            <Run Text="Thumb" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="HyperlinkPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[Complete]" />
                            <Run Text="Hyperlink" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="ResizeGripPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[Complete]" />
                            <Run Text="ResizeGrip" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="GroupBoxPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[Complete]" />
                            <Run Text="GroupBox" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="DataGridPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[In Progress]" />
                            <Run Text="DataGrid" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="FramePage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[In Progress]" />
                            <Run Text="Frame" />
                        </TextBlock>
                    </ListViewItem>
                    <ListViewItem Tag="DatePickerPage.xaml">
                        <TextBlock>
                            <Run FontWeight="Bold" Text="[In Progress]" />
                            <Run Text="DatePicker" />
                        </TextBlock>
                    </ListViewItem>
                </ListView>

                <ComboBox x:Name="ThemeChanger" Grid.Row="1" Margin="5 10" SelectionChanged="ThemeChanger_SelectionChanged">
                    <ComboBoxItem Content="Light" Tag="Light" />
                    <ComboBoxItem Content="Dark" Tag="Dark" IsSelected="True"/>
                    <ComboBoxItem Content="HighContrast" Tag="HighContrast"/>
                </ComboBox>
            </Grid>
        </Border>

        <!-- Frame to Load Pages -->
        <Frame x:Name="MainFrame" Grid.Column="1" NavigationUIVisibility="Hidden" />

    </Grid>
</Window>