public MainWindow()
        {
            InitializeComponent();
            FormBorderStyle = FormBorderStyle.FixedSingle;

            m_backend = new Backend(this);
            download_label.Text = "Downloading build index";
            download_label.Visible = true;

            BackgroundWorker bw = new BackgroundWorker();
            bw.DoWork += PostLoadTasks;
            bw.RunWorkerCompleted += PostLoadTasksCompleted;
            bw.RunWorkerAsync();
        }
        private void start_button_Click(object sender, EventArgs e)
        {
            int first_build;

            if (radio_stable.Checked)
                first_build = 0;
            else
                first_build = first_dev_build.SelectedIndex;

            if (second_dev_build.SelectedIndex <= first_build)
            {
                MessageBox.Show("Second build cannot be less than or equal to the first.", "Error", MessageBoxButtons.OK);
                return;
            }

            start_button.Enabled = false;

            Backend backend = new Backend(first_build, second_dev_build.SelectedIndex, m_build_list, s_major_version);
            backend.BisectEvent += BisectUserDialog;
            backend.UpdateProgress += ChangeProgressBar;

            if (boot_title.Checked)
                backend.Bisect(file_path_textbox.Text);
            else
                backend.Bisect();
        }