title: how to integrate or call or interface with a 3rd party widget within a GWT app?
body: <p>I am making an app in GWT. It is like a dashboard and will have out of the widgets.</p>
  
  <p>Now when we ship this out, there is a use case that the customer might want to create their own GWT widget and use this in the dashboard app.</p>
  
  <p>As I understand it, they will not be able to do this since we cannot ship our source code which is needed to compile the whole app again once  tag of their widget/module gets into the gwt.xml file of my app.</p>
  
  <p>I cannot use anything other that GWT to make this dashboard. And their widget could be say a flash heapmap, a jquery widget/plugin, another GWT module, a jsp page that renders a visualization from back end.</p>
  
  <p>So far my thoughts have been to provide a widget in my app which is a wrapper in the form of an Iframe and call their main page (they will provide url), and have an api to let my app and their widget talk.</p>
  
  <p>But I would like to know if there are other / better approaches?</p>