A method of instantiation "Controls" in a standard way onload.

Controls.js

var Controls = {
    init: function (container) {

        // Matches "control-something"
        var typeRegex = /control-([a-z0-9\-]+)(\s|$)/i;

        container.select('.init').each(function (el) {
            var control_name = typeRegex.exec(el.className)[1].camelize().ucfirst();
            try {
                this.createnewControl(control_name, el);
            }
            catch (ex) {
                alert('Could not load control ' + control_name + ': ' + ex);
            }
        }, this);
    }
};

Controls.Base = Class.create({
    container: null,
    defaults: {},
    settings: null,
    initialize: function (container, settings) {
        this.container = container;
        this.settings = Util.extend(this.defaults, settings || {});
        this.container.Control = this;
    }
});


var Page = {
    debug: false,
    init: function (container) {
        container = $(container || document.body);
        Controls.init(container);
    },
    loadPartial: function (container, url, options) {
        options = Util.extend({
            method: 'get',
            onSuccess: function (xhr) {
                container.innerHTML = xhr.responseText;
                Page.init(container);
            },
            onFailure: function (xhr) {
                container.innerHTML = Util.translate('PARTIAL_PAGE_UPDATE_FAILURE');
            }
        }, options);

        new Ajax.Request(url, options);
    }
}

document.observe('dom:loaded', function () {
    Page.init();
});

Controls.AwesomeSearch = Class.create(Controls.Base, {
    defaults: {
        minChars: 3,
        delay: 250,
        actions: {}
    },
    initialize: function ($super, container, settings) {
        $super(container, settings);

        this.searchInput = container.select('.searchInput')[0];
        this.searchInput.observe('keydown', this.keydown.bind(this));
    },

    keydown: function (e) {
        // do something
    }
});

/* example HTML
 * <div class="control-awesome-search init">
 *  <input class="searchInput">
 * </div>
*/