code: public void setCenterCoordsRelativeToParent(int x, int y) {
  
          Style style = getElement().getStyle();
          style.setLeft(x - 10, Unit.PX);
          style.setTop(y - 10, Unit.PX);
      }
docs: Positions the center of this widget over the given coordinates.<p>
  
  @param x the x coordinate
  @param y the y coordinate