Mif.Tree() Never init's with element is null

what am I missing?

even the simplest:
    sandbox.mooTree = new Mif.Tree({
        container: document.id('my-container-id'),
        forest: true,
        initialize: function(){
            this.initCheckbox('simple');
            new Mif.Tree.KeyNav(this);
        },
    });
errors out with element is null in Mif.Tree at:
...
this.wrapper = new Element('div').addClass('mif-tree-wrapper').injectInside(this.container);
...

I never even get a chance to load any json

container defined as:
<div id="my-container-id"></div>
and is definitely available before the Tree() call  - I've checked.

Last edited by Codename: Steeve Knight (2010-06-19 20:19:04)