title: Change column/row index of node in GridPane
body: <p>I am using a GridPane as a n by m matrix in which I need to be able to resize horizontal bars.</p>
  
  <p>I have a Circle that I have added to as a child of the GridPane, and I have an action listener which allows me to resize the horizontal bars, and that it working correctly.</p>
  
  <p>I am using </p>
  
  <pre><code>int col = GridPane.getColumnIndex(dragAnchor);
  </code></pre>
  
  <p>to get the index that the anchor was in, and then I call:</p>
  
  <pre><code>GridPane.setColumnIndex(dragAnchor, newCol); 
  </code></pre>
  
  <p>(where newCol is the returned value +/- 1 depending on if I increased or decreased the size).</p>
  
  <p>When I do this the Circle node does not move on the gridPane, the col that is returned is the correct position, too. Is there something else that must be done to move a node that has already been added to a GridPane?</p>