Static class question

[Lubos Pintes]

Hi,
I saw one ListBox class implementation.
As we all know, ListBox class collects and displays strings. Author 
decided that he encapsulate the Object as item, and uses its toString() 
method when string is needed for display.
For cases when string is added, he defined this small class, internal to 
ListBox:
[code]
        private static class StringItem
        {
                private string _str;
                public this(string s)
                {
                        this._str = s;
                }

                public override string toString()
                {
                        return this._str;
                }
        }
[/code]

After I read about attributes on dlang, I think the static could be 
removed from above definition. Is this true?
Thank