Glassmapper for TreelistEx with items of multiple templates

Question

In Sitecore, I have a Carousel template in which there is slides field of type TreelistEx. Slides would contain any items based on either DesignedSlide or VideoSlide template.

DesignedSlide or VideoSlide are inheriting from BaseSlide template.

Following is my class definitions.

    [SitecoreType(TemplateId = Constants.BaseSlideTemplateId)]
    public class BaseSlide
    {
        [SitecoreField(FieldName = "title")]
        public virtual string Title { get; set; }
    }


    [SitecoreType(TemplateId = Constants.DesignedSlideTemplateId)]
    public class DesignedSlide : BaseSlide
    {
        [SitecoreField(FieldName = "imageEffect")]
        public virtual string ImageEffect { get; set; }
    }

    [SitecoreType(TemplateId = Constants.VideoSlideTemplateId)]
    public class VideoSlide : BaseSlide
    {
        [SitecoreField(FieldName = "videoId")]
        public virtual string VideoId { get; set; }
    }



    [SitecoreType(TemplateId = Constants.CarouselTemplateId)]
    public class Carousel
    {
        [SitecoreField(FieldName = "slides")]
        public virtual IEnumerable<BaseSlide> Slides { get; set; }
    }

Using Glassmapper, I want to retrieve collection of slides and while iterating I should be able to identify whether its a video slide or designed slide.

Can anyone please give some inputs?

Thanks in advance.