this._persist.before.penetrate.children()

// proto penetration tests:

        _penetrate: function()
        {
                var     t = this,
                        m = $.tri4m.widget.hook.uuid.cache.__dict,
                        s = $.tri4m.widget.hook.uuid.cache.__mapping,
                        x = $.tri4m.widget.hook.uuid.cache.__class,
                        n = this.widgetName,
                        e = this.element;
                ...

                this._persist.before.penetrate.children();
                this._persist.wrap.penetrate.children();

                for(var i in s[n])
                {
                        ...

                        this._persist.before.penetrate.child(i, d);

                        ...

                        this._persist.after.penetrate.child(i, d);
                }

                this._persist.wrap.penetrate.children();
                this._persist.after.penetrate.children();
        },