Tree component is not accessible with tab key

I am trying to tab through the items of a tree component to make my site Section 508 compliant, but the tree does not allow for this.

So I added this…

Page.getCurrent().getJavaScript().execute("$(document).ready(function(){$('.v-tree-node-children .v-tree-node, .v-tree').attr('tabindex', '0');});");

…which allows me to tab through, but I cannot click on any of the focused menu items. Any advice? This is a problem.