Creating a Dialog service for Windows Store apps using Caliburn.Micro

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public class DialogService : IDialogService
{
    
    public virtual Task ShowPopupAsync<T>(object context = null, IDictionary<string, object> settings = null) where T : IScreen
    {
        var rootModel = IoC.Get<T>();
        return ShowPopupAsync(rootModel, context, settings);
    }
     
    public virtual Task ShowPopupAsync(IScreen rootModel, object context = null, IDictionary<string, object> settings = null)
    {
        var taskCompletionSource = new TaskCompletionSource<bool>();
 
        var popup = CreatePopup(rootModel, settings);
        var view = ViewLocator.LocateForModel(rootModel, popup, context);
 
        popup.Child = view;        
 
        ViewModelBinder.Bind(rootModel, popup, null);
        Caliburn.Micro.Action.SetTargetWithoutContext(view, rootModel);
 
        SetPopupPosition(popup, view);
        
        var activatable = rootModel as IActivate;
        if (activatable != null)
        {
            activatable.Activate();
        }
 
        var deactivator = rootModel as IDeactivate;
 
        popup.Closed += delegate
        {
 
            try
            {
                rootModel.CloseView = null;
                if (deactivator != null)
                {
                    deactivator.Deactivate(true);
                }
            }
            finally
            {
 
                taskCompletionSource.SetResult(true);
            }
 
        };
 
 
 
        popup.IsOpen = true;
        return taskCompletionSource.Task;
    }
 
    private void SetPopupPosition(Popup popup, UIElement popupContent)
    {
        var windowContnt = Window.Current.Content as UIElement;
 
        popupContent.Measure(new Size(Window.Current.Bounds.Width, Window.Current.Bounds.Height));
        popupContent.Arrange(new Rect(0, 0, popupContent.DesiredSize.Width, popupContent.DesiredSize.Height));
 
        var horizontalOffset = Math.Max(0, Window.Current.Bounds.Width / 2 - popupContent.DesiredSize.Width / 2);
        var verticalOffset = Math.Max(0, Window.Current.Bounds.Height / 2 - popupContent.DesiredSize.Height / 2);
 
        popup.HorizontalOffset = horizontalOffset;
        popup.VerticalOffset = verticalOffset;
    }
 
 
    protected virtual Popup CreatePopup(object rootModel, IDictionary<string, object> settings)
    {
        var popup = new Popup();
 
    popup.IsLightDismissEnabled = true;
        ApplySettings(popup, settings);
 
        return popup;
    }
 
 
 
    bool ApplySettings(object target, IEnumerable<KeyValuePair<string, object>> settings)
    {
        if (settings != null)
        {
            var type = target.GetType();
 
            foreach (var pair in settings)
            {
                var propertyInfo = type.GetPropertyCaseInsensitive(pair.Key);
 
                if (propertyInfo != null)
                {
                    propertyInfo.SetValue(target, pair.Value, null);
                }
            }
 
            return true;
        }
 
        return false;
    }
 
}