I do not understand how the DefaultProperty Metadata tag work or what it signifies. I've read the MSDN and went through the sample but I find it confusing.

DefaultPropertyAttribute Class

I've read a few blogs and they seem to refer to the indexers. I'm not sure why you would want metadata for your properties? I am coming from a Java background, perhaps a Java analogy would help.

[DefaultProperty("Value")]
    public abstract class FOO<T> : ANY, IBAR<T>
    {
        public FOO() { }
        public FOO(T value) { this.Value = value; }
        public virtual T Value { get; set; }
    }

Follow up: Property Grid