S7Explorer/MainWindow.xaml

<Window x:Class="S7Explorer.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:S7Explorer"
        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit" mc:Ignorable="d" Title="S7 Project Explorer" Height="700"
        Width="1000" WindowStartupLocation="CenterScreen">

    <Window.Resources>
        <!-- Icon Converter -->
        <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />

        <!-- HierarchicalDataTemplate for TreeView Items -->
        <HierarchicalDataTemplate x:Key="ProjectItemTemplate" ItemsSource="{Binding Children}">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Name}" Margin="5,0,0,0" />
            </StackPanel>
        </HierarchicalDataTemplate>

        <!-- Log Entry Template -->
        <DataTemplate x:Key="LogEntryTemplate">
            <TextBlock Text="{Binding}" />
        </DataTemplate>
    </Window.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="120" />
        </Grid.RowDefinitions>

        <!-- Toolbar -->
        <ToolBar Grid.Row="0">
            <Button Content="Load Project" Command="{Binding LoadProjectCommand}"
                    ToolTip="Load a Siemens S7 project file (.s7p)" Style="{StaticResource ToolbarButtonStyle}" />
            <Button Content="Reload" Command="{Binding ReloadProjectCommand}" ToolTip="Reload the current project"
                    Style="{StaticResource ToolbarButtonStyle}" IsEnabled="{Binding IsProjectLoaded}" />
            <Separator />
            <Button Content="Export" Command="{Binding ExportDocumentationCommand}"
                    ToolTip="Export project documentation to a file" Style="{StaticResource ToolbarButtonStyle}"
                    IsEnabled="{Binding IsProjectLoaded}" />
            <Separator />
            <Label Content="Search:" VerticalAlignment="Center" />
            <TextBox Width="200" Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged}"
                    VerticalAlignment="Center" Margin="5" />
            <Button Content="Find" Command="{Binding SearchCommand}" ToolTip="Search in project"
                    Style="{StaticResource ToolbarButtonStyle}" IsEnabled="{Binding IsProjectLoaded}" />
            <CheckBox Content="Case Sensitive" VerticalAlignment="Center" Margin="5"
                    IsChecked="{Binding IsCaseSensitive}" />
            <CheckBox Content="Regex" VerticalAlignment="Center" Margin="5" IsChecked="{Binding UseRegex}" />
        </ToolBar>

        <!-- Main Content -->
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="350" />
                <ColumnDefinition Width="5" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>

            <!-- Project Explorer Tree -->
            <DockPanel Grid.Column="0">
                <ToolBar DockPanel.Dock="Top">
                    <Button Content="Expand All" Command="{Binding ExpandAllCommand}" ToolTip="Expand all tree nodes"
                            Style="{StaticResource ToolbarButtonStyle}" IsEnabled="{Binding IsProjectLoaded}" />
                    <Button Content="Collapse All" Command="{Binding CollapseAllCommand}"
                            ToolTip="Collapse all tree nodes" Style="{StaticResource ToolbarButtonStyle}"
                            IsEnabled="{Binding IsProjectLoaded}" />
                </ToolBar>

                <TreeView ItemsSource="{Binding ProjectStructure}" ItemTemplate="{StaticResource ProjectItemTemplate}"
                        SelectedItemChanged="TreeView_SelectedItemChanged" VirtualizingPanel.IsVirtualizing="True"
                        VirtualizingPanel.VirtualizationMode="Recycling">
                </TreeView>
            </DockPanel>

            <!-- Splitter -->
            <GridSplitter Grid.Column="1" Width="5" HorizontalAlignment="Stretch" />

            <!-- Property Grid -->
            <xctk:PropertyGrid Grid.Column="2" SelectedObject="{Binding SelectedItemDetails}"
                    AutoGenerateProperties="True" IsReadOnly="True" ShowSearchBox="True" ShowSortOptions="True"
                    ShowTitle="True" ShowAdvancedOptions="False" />
        </Grid>

        <!-- Status Bar -->
        <StatusBar Grid.Row="2">
            <StatusBarItem>
                <TextBlock Text="{Binding ProjectPath}" Style="{StaticResource StatusTextStyle}" />
            </StatusBarItem>
            <Separator />
            <StatusBarItem>
                <TextBlock Text="{Binding SelectedItem.Name, StringFormat=Selected: {0}}"
                        Style="{StaticResource StatusTextStyle}" />
            </StatusBarItem>
            <StatusBarItem HorizontalAlignment="Right">
                <ProgressBar Width="100" Height="15" IsIndeterminate="{Binding IsLoading}"
                        Visibility="{Binding IsLoading, Converter={StaticResource BooleanToVisibilityConverter}}" />
            </StatusBarItem>
        </StatusBar>

        <!-- Log View -->
        <DockPanel Grid.Row="3">
            <ToolBar DockPanel.Dock="Top">
                <Label Content="Log:" VerticalAlignment="Center" />
                <Button Content="Clear" Command="{Binding ClearLogCommand}" ToolTip="Clear log messages"
                        Style="{StaticResource ToolbarButtonStyle}" />
            </ToolBar>

            <ListView ItemsSource="{Binding LogEntries}" ItemTemplate="{StaticResource LogEntryTemplate}"
                    ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto"
                    VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.VirtualizationMode="Recycling">
            </ListView>
        </DockPanel>

        <!-- Loading Overlay -->
        <Grid Grid.RowSpan="4" Visibility="{Binding IsLoading, Converter={StaticResource BooleanToVisibilityConverter}}">
            <Rectangle Fill="Black" Opacity="0.3" />
            <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                <TextBlock Text="Loading..." FontSize="20" Foreground="White" />
                <ProgressBar Width="200" Height="20" IsIndeterminate="True" Margin="0,10,0,0" />
            </StackPanel>
        </Grid>
    </Grid>
</Window>