title: JavaFX 2.0: What do I have to do to react on a row selection change in a table?
body: <p>I want to do a very easy and common thing but don't find a way to do it with JavaFX.
  I have a TableView with two columns and want to enable a button if at least one row is selected. If no row is selected I want to disable the button again. </p>
  
  <p>For that I need to get a selection changed event or something like that. Shouldn't be there a possibility to set the selectionModel of the tableView on action or add a listener to it?
  What do I have to do?</p>