I have a custom block with two properties - an image url and an alternative text

 [ContentType(
        GUID = "387A029C-F193-403C-89C9-375A2A6BF028",
        AvailableInEditMode = false,
        DisplayName = "Image" 
        )]

    public class ImageBlock : EPiServer.Core.BlockData
    {
        [UIHint(UIHint.Image)]
        [Display(
            Name = "Image Url",
            Description = "",
            GroupName = SystemTabNames.Content,  
            Order = 10)]
       
        public virtual Url ImageUrl { get; set; }

        [Display(
            Name = "Alternative text",
            GroupName = SystemTabNames.Content,
            Order = 20)]
        [CultureSpecific]
        public virtual string AlternativeText { get; set; }
        
    }

I have created a partial view in shared directory /shared/ImageBlock/index.cshtml as 

@model ImageBlock
<img src="@Model.ImageUrl" />

So I am hoping when I call something like 

@Html.PropertyFor(p=>p.CurrentPage.TestProperty)

My partial view should get called, but the partial view never gets called.

- TestProperty is a property of type ImageBlock

Can any body please help me