title: How do you make an Imageview to resize itself when the Window gets resized
body: <p>I have a GridPane with an arbitrary number of rows and columns, and fill each cell with an ImageView.</p>
  
  <p>Now, this GridPane is contained in an AnchorPane, so when the Window gets resized the GridPane grows or shrinks fine, but the ImageViews does not change its size.</p>
  
  <p>What do I have to do to make the ImageView take the size of its cell in the GridPane?</p>