title: Javafx combobox styling
body: <p>I need a combobox in javaFX whose popup behavior can be controlled, like upon clicking the combobox, instead of default behavior where it shows a drop down, i want the drop down to be shown above the combobox (insetad of display below the combobox) .</p>
  
  <p>Is it possible ? 
  Can we do this with css ?</p>
  
  <p>Thanks for any help.</p>