How do I create photo gallery in kaliko CMS?

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C#3.5

CMS

.NET4.6

I want to use image property of kaliko CMS in list to make photo gallery .
I am saving all files in server files/images folder

[ImageProperty("News image", TabGroup = "NewImage")]
 public virtual ImageProperty NewsImages { get; set; }

News images I want to use as List but error come invalid html identifier list.
So generic list cannot be used , Is there any other way I can store multiple images and make a library of 1 list in c# using kaliko CMS?

What I have tried:

[ImageProperty("News image", TabGroup = "NewImage")]
         public virtual List<mageProperty> NewImage { get; set; }

That is wrong