title: How to draw under transparent image using JAVA FX 2
body: <p>i'm building a Java FX 2 app wich must show animations under a transparent png image, by drawing rectangles to the "Graphics" of a pane located below an image view containing the image.</p>
  
  <p>After hours of searching, i've found only examples that create a rectangle and then, add it to the scene once. However, i need to paint in a loop (every few milliseconds) and i have no idea how to paint directly to the pane.</p>
  
  <p>I'm using FXML to build the GUI.</p>
  
  <p>It's possible to paint to the graphics of any component in Java FX, in the same way as Swing?</p>
  
  <p>Thanks in advance. </p>