public static DirectoryViewer add_Directory(this IStep step, string startDirectory)
{
var directory = new DirectoryViewer();
directory.Dock = DockStyle.Fill;
directory._HideFiles = true;
directory._ViewMode = DirectoryViewer.ViewMode.Simple_With_LocationBar;
directory.AllowDrop = false;
directory.openDirectory(startDirectory);
directory.refreshDirectoryView();
directory._WatchFolder = true;
step.add_Control(directory);
return directory;
}