I have the following situation:

$.widget("daredevel.tree", {
    _create:function () {
        this.element.treecheckbox(this.options);
        this.element.treecollapse(this.options);
        this.element.treednd(this.options);
    }
});

$.widget("daredevel.treecheckbox", {
    _create:function () {
        /*...*/
    }
});

$.widget("daredevel.treecollapse", {
    _create:function () {
        /*...*/
    }
});

$.widget("daredevel.treednd", {
    _create:function () {
        /*...*/
    }
});

The core components load other components. In Firefox, Opera and Chrome, everything is ok, but in IE8 the 2nd call fires error "Stack overflow al line 443". Order of calls doesn't matters. It simply crash on the 2nd call.