title: Vaadin Panel highlight on mouseover
body: <p>I have a set of Vaadin's Panels.</p>
  
  <p>I need to highlight each panel component on mouse over event and release the highlighting on mouse out. Also on click I need to change the style of the component permanently to another.</p>
  
  <p>Could you please show an example how it can be done in Vaadin ?</p>