title: Vaadin Grid with Generated Properties and Sorting
body: <p>I have several columns in a Vaadin Grid that only contain values of items that are in a sortable Container, but they're added as Generated Properties as well due to the fact that there needs to be custom HTML title-tag to go with the value. With Generated Property and HtmlRenderer it works and renders fine, but using them makes all the columns unsortable. With a Table this could be done with a CellStyleGenerator I think, but there are several advantages with the Grid. Is there any workaround to fix this and make the columns sortable again?</p>
  
  <p>Using a HtmlRenderer together with a Converter should work otherwise, but I need the object reference itself and not just the field the Converter has, as the html title-tag needs to contain some meta-information.</p>