Welcome back to our continuing issue, b_p! ;)

I've spent some time working on this over the last few weeks.  I've put in a resize() method that a napplet can use to resize itself.  The trick is that this only seems to work if the base sketch is using the P2D renderer.

Here's a sample sketch (make sure you're using the latest version of napplet, 0.3.2).

1. import napplet.*;
   
   NAppletManager napMan;
   
   void setup() {
     size(400, 400, P2D);
   
     napMan = new NAppletManager(this);
     napMan.createEmbeddedNApplet("TopMenuBar", 0, 0);
    
     frame.setResizable(true);
    
   }
   
   void draw() {
     background(0);
   }
   
   public class TopMenuBar extends NApplet {
    
     void setup() {
       size(parentPApplet.width, 100);
     }
   
     void draw() {
       if (width != parentPApplet.width) {
         resize(parentPApplet.width, 100);
       }
       background(255);
     }
    
   }

No, my fault actually.  I didn't realize that I hadn't uploaded a version with the resize() fix.  Sorry about that. ;)

Get version 0.3.3 off the download page now and the sketch above should work.

Don't do duplicate threads (is this napplet - problems with fore- and background?), it doesn't help to solve an issue.
But posting in the right section can help! napplet isn't a core library (shipped with Processing) but a user-contributed library (you installed it yourself).

Here is a link of someone creating a processing sketch that is re-sizable in a browser

http://www.metaportaldermedienpolemik.net/processing.org/applet_resize/

There are supporting links as to how he achieved the effect.