Graphic keeps disappearing and getting painted over

Question

I am not quite sure what is going on here, but I think that my background is being repainted after I paint my rectangles on the screen, any help on what is going on here would be greatly appreciated.
The way the code is currently set up is when I come into the method, I set my state to -1,
The rectangle will then init itself and then go check my control variables,
The control variables turn the rectangle the appropriate color
since I have rip_staus_code = 10 it turns green, although
The problem is after it turns green;
the rectangle disappears!!!
and I cant quite see where in the code I am repainting over the top of it.....
Thank You
jsg
protected int rx1State = -1
public void paintChildren(Graphics g){  
     super.paintChildren(g);
     Graphics2D g2d = (Graphics2D)g;
   if(rx1State == -1){
           rx1 = new Rectangle2D.Double(29,110,63,57);
           g.setColor(testColor); 
           g2d.fill(rx1);
           g.setColor(Color.black);     
          g2d.setStroke(graphicStroke);
          g.setFont(graphicLabelFont);
          g2d.draw(rx1);     
          g.drawString("rect one",49,142);
//turn rectangle one green
  if(rx1State != 0 && ss.rtRip1_status_code >= 9){  //rip_staus_code is set to 10, so turns green
        drawChangedRect(g,rx1,Color.green);
        g.drawString("rect one",49,142);
        rx1State = 0;
//turns rectangle one red          
  if(rx1State != 2 && ss.rtRip1_status_code < 9){
     drawChangedRect(g,rx1,Color.red);
     g.drawString("Rx1",49,142);
     System.out.println("Turned Rx1 red");
     rx1State = 2;
//turns Rectangle one white
  if(rx1State != 3 && (!ss.ColorRX1RIP1 | !ColorARROWABred )){ //ColorRX1RIP1=true, colorArrowABred=T     
      drawChangedRect(g,rx1,upstreamColor);
      g.drawString("Rx1",49,142);
     rx1State = 3;

Answer 1

I see a couple things wrong here.
First, why are you overwriting paintChildren? If you want to do custom drawing, do that in paintComponent.
Second, never change state inside a painting method. Why? Because you can't control how often repaint is called. Covering or partically covering the window, resizing the window, or programmatic calls to repaint will all cause the method to be called, and sometimes only on a portion of your component (such is the case when only partially covered). This can cause very weird visual effects. In your program, the first call to paint will paint the appropriate rectangle but then set the state flag. There is probably another call to repaint somewhere which will then repaint the component without the rectangle (because the state has now changed), painting over your rectangles. The solution, don't change the state in paint.