Hide Dialog from inside in LWUIT

I have created a Dialog with two buttons Yes, No, and then I have add action listener to them, my problem is that I want no button to hide the Dialog that I have created

the code is looks like:

dialog = new Dialog(title);
        dialog.setDialogType(Dialog.TYPE_CONFIRMATION);

        ta = new TextArea(text);
        ta.getStyle().setBorder(Border.createEmpty());
        ta.setEditable(false);
        yesCommand = new Button("YES");
        noCommand = new Button("NO");

        yesCommand.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent ae) {
                LGBMainMidlet.getLGBMidlet().notifyDestroyed();
            }
        });

        noCommand.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent ae) {
                Logger.Log("Bye Bye");
                dialog = null;
                System.gc();
            }
        });

        dialog.addComponent(ta);
        dialog.addComponent(yesCommand);
        dialog.addComponent(noCommand);
        dialog.show();

the code is not working for me, can anyone told me what is the problem?

B.N. I have used dialog.dispose(), but it exit the whole application

Dialog.dispose() does not exit the whole application, it just closes the dialog. If you have nothing in your application you might see nothing if you dispose the dialog.