Is it possible to reinitialize a CKEditor Combobox/Drop Down Menu?

How do I dynamically update the items in a drop down?

I have a custom plugin for CKEditor that populates a drop down menu with a list of items which I can inject into my textarea.

This list of items comes from a Javascript array called maptags, which is updated dynamically for each page.

var maptags = []

This list of tags gets added to the drop down when you first click on it by the init: function. My problem is what if the items in that array change as the client changes things on the page, how can I reload that list to the updated array?

Here is my CKEditor Plugin code:

CKEDITOR.plugins.add('mapitems', {
    requires: ['richcombo'], //, 'styles' ],
    init: function (editor) {
        var config = editor.config,
        lang = editor.lang.format;       

        editor.ui.addRichCombo('mapitems',
        {
            label: "Map Items",
            title: "Map Items",
            voiceLabel: "Map Items",
            className: 'cke_format',
            multiSelect: false,

            panel:
            {
                css: [config.contentsCss, CKEDITOR.getUrl(editor.skinPath + 'editor.css')],
                voiceLabel: lang.panelVoiceLabel
            },

            init: function () {
                this.startGroup("Map Items");
                //this.add('value', 'drop_text', 'drop_label');
                for (var this_tag in maptags) {
                    this.add(maptags[this_tag][0], maptags[this_tag][1], maptags[this_tag][2]);
                }
            },

            onClick: function (value) {
                editor.focus();
                editor.fire('saveSnapshot');
                editor.insertHtml(value);
                editor.fire('saveSnapshot');
            }
        });
    } 
});