title: GWT: external javascripts loading delayed?
body: <p>I am facing a strange situation: the customer provided us some HTML we are attaching GWT on.
  We are not allowed to use UI Binding, so we have to load the page as is, retrieve elements by their id and change what we need to.</p>
  
  <p>These pages include some third party javascripts, but often at the first load of a page I get some exception about methods not being found. If I reload the page the error is gone and the page works fine.
  I suspect that when the page loads these JS are not available yet, that's why I get errors.
  Is there any way to ensure the external libraries are ready before loading xxx.nocache.js?</p>
  
  <p>Another strange issue: when I add GWT to the page, all the listeners (e.g. button's onClick) are gone and I have to reattach them.</p>
  
  <p>When I open the original page (w/o GWT) everything works fine.</p>
  
  <p>Any suggestions?</p>