How to set the J frame into front?

Question

I am using JDialog swing component to develop a gui.I have a button in my Jdialog.

I set the JDialog setAlwaysontop is true.When user clicks a button then a messagebox will shown.Here what my problem is ,Jdialog is open but when i click the button the messagebox wont displaying.But it runs in background.

 

 

 

public AboutDialog(JPanel parent) {
        setAlwaysOnTop(true);
        getContentPane().add(parent, BorderLayout.SOUTH);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setModal(true);
        setResizable(false);
        setTitle("Editor");
        setIconImage(iPrintManager);
        pack();
        setVisible(true);
    }

 The jframe:

final JFrame d=new JFrame();
JOptionPane.showMessageDialog(d,"Successfully modified","Alert",JOptionPane.INFORMATION_MESSAGE);

 

Help me to solve my issue.