Datatable inside a collapsed panel

I tried to initialize a table with DataTable() inside a collapsed panel on click on the panel-heading but I get a broken result: https://docs.google.com/file/d/0ByzbHcAxmCyvbXVVNTNYUXE1Qms/edit

Any workaround? If I open the console the page kinda "redraw" and it fixes the issues after a few seconds. That's basically some kind of bug, the browser doesn't redraw correctly the table content.

Thanks.