private void drop(final DropTargetDropEvent event) {
logger.debug("Event:" + event);
Transferable transferable = event.getTransferable();
try {
// Cannot cast transferable.
final ComponentReference componentReference = (ComponentReference) transferable
.getTransferData(ComponentSourceTransferable.FLAVOR);
final Point location = event.getLocation();
// The component might not have loaded if the network is slow.
new Thread() {
@Override
public void run() {
try {
Component component = componentReference.getComponent();
addNode(component, location);
// To be able to delete the added node by the keyboard.
GraphCanvas.this.panel.requestFocusInWindow();
// XXX this sometimes throws exception.
event.dropComplete(true);