Refreshing jQuery Mobile listviews

[Rob Dennett]

I have a ul with the data-role="listview" attribute. When this gets updated, I call $('#myUlId').listview('refresh') as specified in the docs but it barks at me that "Uncaught cannot call methods on listview prior to initialization; attempted to call method 'refresh'". Why is listview uninitialized if the element has the aforementioned attribute?

Thanks,
Rob