title: Drag & Drop Shapes on Canvas
body: <p>I put several shapes (like <code>Ellipse</code> and <code>Rectangle</code>) on a <code>Canvas</code>.
  Now, I want user to be able to drag &amp; drop these shapes.
  Is there some predefined functionality that I can use, or I should implement the drag &amp; drop myself using the mouse events ?</p>
  
  <p>Thanks ! </p>