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EpiEssentials ContentAreaMaxItems

Limit how many items can go into a content area.

To use, put the attribute on your property:

[Display(Name = "Items", Description = "max 3 items", 
GroupName = SystemTabNames.Content, Order = 1)]
[AllowedTypes(typeof(ItemBlock))]
[ContentAreaMaxItems(3)]
public virtual ContentArea Items{ get; set; }