WPF Progress Bar in a separate Window

MainWindow.xaml.cs

using System;
using System.ComponentModel;
using System.Threading;
using System.Windows;

namespace WPFProgressBar
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        ProgressBarWindow pbw = null;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, RoutedEventArgs e)
        {
            // Calls the method that does work of which the progress will be shown.
            ShowProgress();
        }

        void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // Notifying the progress bar window of the current progress.
            pbw.UpdateProgress(e.ProgressPercentage);
        }

        void ShowProgress()
        {
            try
            {
                // Using background worker to asynchronously run work method.
                BackgroundWorker worker = new BackgroundWorker();
                worker.WorkerReportsProgress = true;
                worker.DoWork += ProcessLogsAsynch;
                worker.ProgressChanged += worker_ProgressChanged;
                worker.RunWorkerAsync();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "ERROR");
            }
        }

        private void ProcessLogsAsynch(object sender, DoWorkEventArgs e)
        {
            Dispatcher.Invoke(() =>
            {
                // Disabling parent window controls while the work is being done.
                btnStart.IsEnabled = false;

                // Launch the progress bar window using Show()
                // Note: ShowDialog() wouldn't work as it waits for the child window to close.
                pbw = new ProgressBarWindow();
                pbw.Show();
            });

            for (int i = 1; i <= 100; i++)
            {
                // Simulates work being done
                Thread.Sleep(100);

                // Reports progress
                (sender as BackgroundWorker).ReportProgress(i);
            }

            Dispatcher.Invoke(() =>
            {
                // Enables parent window controls
                btnStart.IsEnabled = true;
            });
        }
    }
}

ProgressBarWindow.xaml

<Window x:Class="WPFProgressBar.ProgressBarWindow"
        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:WPFProgressBar"
        mc:Ignorable="d"
        Title="ProgressBarWindow" Height="80" Width="400">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <ProgressBar Grid.Column="0" Grid.Row="0"
                     Name="pbLoad"
                     Visibility="Visible"
                     Margin="12, 4" Height="24"
                     Value="0" Minimum="0" Maximum="100"/>
        <StackPanel Grid.Column="0" Grid.Row="0"
                    Orientation="Horizontal"
                    HorizontalAlignment="Center" VerticalAlignment="Center">
            <!-- TextBlock displayed in the center of the Progress Bar -->
            <!-- Indicates progress as a percentage -->
            <!-- Binds 'Value' property of ProgressBar control to TextBlock Text -->
            <TextBlock Name="tbProgress" Visibility="Visible"
                       Text="{Binding ElementName=pbLoad, Path=Value, StringFormat={}{0:0}%}" 
                       HorizontalAlignment="Center" VerticalAlignment="Center" />
        </StackPanel>
    </Grid>
</Window>

ProgressBarWindow.xaml.cs

using System.Windows;

namespace WPFProgressBar
{
    /// <summary>
    /// Interaction logic for ProgressBarWindow.xaml
    /// </summary>
    public partial class ProgressBarWindow : Window
    {
        public ProgressBarWindow()
        {
            InitializeComponent();
        }

        public void UpdateProgress(int percentage)
        {
            // When progress is reported, update the progress bar control.
            pbLoad.Value = percentage;

            // When progress reaches 100%, close the progress bar window.
            if (percentage == 100)
            {
                Close();
            }
        }
    }
}