@Override protected void invalidated() {
                    final double WIDTH = get();
                    if (WIDTH < 0 || WIDTH > 50) set(clamp(0.0, 50.0, WIDTH));
                    fireTileEvent(REDRAW_EVENT);
                }
Defines the width in pixels that will be used to draw the border of the tile.
The value will be clamped between 0 and 50 pixels.

@param WIDTH
src/main/java/eu/hansolo/tilesfx/Tile.java