Edit in JSFiddle

// Template for the custom category renderer
var customCategoryRendererTemplate = "<template>"
    + "<div attach-point='renderNode'>"
    + "{{item.category}}"
    + "<div class='d-spacer'></div>"
    + "<a class='categoryLink' navindex='0' href='http://en.wikipedia.org/wiki/Special:Search?search={{item.category}}&go=Go'>Wikipedia</a>"
    + "</div>"
+ "</template>";

require.config({
    baseUrl: "http://ibm-js.github.io/libraries/master/"
});
require(["deliteful-build/layer"], function () {
		require([
			"delite/register",
            "dstore/Memory",
			"deliteful/list/CategoryRenderer",
			"deliteful/list/List",
			"delite/handlebars",
            "requirejs-dplugins/css!delite/themes/defaultapp.css",
			"delite/theme!delite/themes/{{theme}}/global.css", // page level CSS
			"requirejs-domready/domReady!"
		], function (register, Memory, CategoryRenderer, List, handlebars) {
			var MyCustomRenderer = register("d-cust-category", [HTMLElement, CategoryRenderer], {
				template: handlebars.compile(customCategoryRendererTemplate)
			});
			var list = new List();
			list.categoryAttr = "cat";
			list.categoryRenderer = MyCustomRenderer;
            var dstore = new Memory();
			dstore.add({label: "Apple", cat: "Fruit"});
			dstore.add({label: "Apricot", cat: "Fruit"});
			dstore.add({label: "Banana", cat: "Fruit"});
			dstore.add({label: "Orange", cat: "Fruit"});
			dstore.add({label: "Pear", cat: "Fruit"});
			dstore.add({label: "Strawberry", cat: "Fruit"});
			dstore.add({label: "Brussel sprout", cat: "Vegetable"});
			dstore.add({label: "Cabbage", cat: "Vegetable"});
			dstore.add({label: "Kale", cat: "Vegetable"});
			dstore.add({label: "Lettuce", cat: "Vegetable"});
            list.source = dstore;
			list.placeAt(document.body);
            document.body.style.display = "";
        });
});
.d-list-category .d-list-cell {
    background-image: none;
    background-color: green;
    color: white;
    height: 45px;
}
.categoryLink {
    color: white;
    font-size: small;
}