code: public void setBlurContentPane(boolean blur) {
  		final JXLayer jxLayer = (JXLayer) getContentPane();
  		if (blur && jxLayer.getBufferedImageOp() instanceof FastBlurFilter
  				|| !blur && !(jxLayer.getBufferedImageOp() instanceof FastBlurFilter)) {
  			return;
  		}
  		final BufferedImageOp bio = new FastBlurFilter(1);
  		jxLayer.setBufferedImageOp(blur ? bio : null);
  	}
docs: Floute ou défloute le contentPane de la frame principale.
  @param blur boolean