J2ME. Game Canvas Form switching

public class myMIDlet extends MIDlet implements ... {
...
Form myForm = new Form( ... 
...
myGameCanvas ggg = new myGameCanvas(... , this) // <=== note the last parameter - the key to it all
...
display.setCurrent(ggg);
...
}

class myGameCanvas extends GameCanvas implements ... {
myMIDlet myHost; // the breadcrumb

    public myGameCanvas(... , myMIDlet host) {
    super(...);
    myHost = host; // remember our host MIDlet
    ...
    }

    ... wherever you want to got to the form (probably in a commandAction or keyPressed)
    Display disp = myHost.getDisplay();
    disp.setCurrent(myHost.myForm);

}