private void OnShowWinformsWindow(object sender, RoutedEventArgs e)
{
var winFormsWindow = dockManager.Layout.Descendents().OfType<LayoutAnchorable>().Single(a => a.ContentId == "WinFormsWindow");
if (winFormsWindow.IsHidden)
winFormsWindow.Show();
else if (winFormsWindow.IsVisible)
winFormsWindow.IsActive = true;
else
winFormsWindow.AddToLayout(dockManager, AnchorableShowStrategy.Bottom | AnchorableShowStrategy.Most);
}