public void setKeepAspect(final boolean KEEP) {
        if (null == keepAspect) {
            _keepAspect = KEEP;
        } else {
            if (!keepAspect.isBound()) {
                keepAspect.set(KEEP);
            }
        }
    }
Defines if the control should keep it's aspect. This is
in principle only needed if the control has different width and
height.

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