BufferStrategy - it doesn't update graphics

Newbie & Debugging Questions
#1

Hi, I’m having problems with BufferStrategy… for some reason I can’t manage to update the graphics in it:

public void Draw()
    {
        backbuffer = this.getBufferStrategy();
        
        do 
        {
            try{
                    graphics = backbuffer.getDrawGraphics();
                    DrawAll(); //this draws thing on "graphics"
            }
            finally
            {
                graphics.dispose();
            }

            backbuffer.show();
            Toolkit.getDefaultToolkit().sync();
        } while (backbuffer.contentsLost());
    }

It is necessary to say that I always call this method? but for some reason I can’t see my … new graphics?
If you need more details, just tell me.

Thanks.