MainWindow.xaml

<Window x:Class="AristaNetworkManager.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:views="clr-namespace:AristaNetworkManager.Views"
        xmlns:local="clr-namespace:AristaNetworkManager"
        xmlns:viewmodels="clr-namespace:AristaNetworkManager.ViewModels"
        mc:Ignorable="d"
        Title="Arista Network Manager" Height="600" Width="1000">
    <Window.DataContext>
        <viewmodels:MainWindowViewModel/>
    </Window.DataContext>
    <Grid Margin="10">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="250"/>
            <ColumnDefinition Width="5"/>
            <ColumnDefinition Width="250"/>
            <ColumnDefinition Width="5"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <!-- Left Panel - Switch List -->
        <Grid Grid.Column="0">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>

            <Button Command="{Binding AddNewSwitchCommand}" Margin="0,0,0,10">
                <TextBlock Text="Add New Switch"/>
            </Button>

            <ListBox Grid.Row="1" 
                     ItemsSource="{Binding Switches}"
                     SelectedItem="{Binding SelectedSwitch}">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <StackPanel>
                                <TextBlock Text="{Binding Model.Hostname}" FontWeight="Bold"/>
                                <TextBlock Text="{Binding Model.IpAddress}" Foreground="Gray"/>
                                <TextBlock Text="{Binding Model.Status}" Foreground="DarkGray"/>
                            </StackPanel>
                            <Button Grid.Column="1" 
                                    Command="{Binding DataContext.RemoveSwitchCommand, 
                                              RelativeSource={RelativeSource AncestorType=Window}}"
                                    CommandParameter="{Binding}"
                                    Margin="5,0,0,0">
                                <TextBlock Text="Remove"/>
                            </Button>
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>

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

        <!-- Middle Panel - Switch Details -->
        <views:SwitchDetailsView Grid.Column="2" 
                                DataContext="{Binding SelectedSwitch}"
                                Visibility="{Binding Converter={StaticResource NullToVisibilityConverter}}"/>

        <!-- Splitter -->
        <GridSplitter Grid.Column="3" Width="5" HorizontalAlignment="Stretch"/>

        <!-- Right Panel - Configuration -->
        <Grid Grid.Column="4">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>

            <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="0,0,0,10">
                <Button Command="{Binding SelectedSwitch.FetchConfigurationCommand}" Margin="0,0,10,0">
                    <TextBlock Text="Refresh Configuration"/>
                </Button>
                <Button Command="{Binding SelectedSwitch.UpdateConfigurationCommand}" 
                        CommandParameter="{Binding SelectedSwitch.Configuration}"
                        Margin="0,0,10,0">
                    <TextBlock Text="Apply Configuration"/>
                </Button>
            </StackPanel>

            <TextBox Grid.Row="1" 
                     Text="{Binding SelectedSwitch.Configuration, UpdateSourceTrigger=PropertyChanged}"
                     AcceptsReturn="True"
                     VerticalScrollBarVisibility="Auto"
                     HorizontalScrollBarVisibility="Auto"
                     FontFamily="Consolas"/>
        </Grid>
    </Grid>
</Window>