Show Password check box in blackberry?

public class passwordTextField extends EditField
    {
        private final static String INIT_TEXT = "Enter Password";
        protected void paint(Graphics graphics)
        {
            String originalText = getText();
            String fakeText = originalText;
            if (originalText.equalsIgnoreCase(""))
            {
                fakeText = isFocus() ? originalText : INIT_TEXT;
            }
            else
            {
                if(LogInPage.flag == true)
                {
                    setText(originalText);
                }
                else
                {
                    fakeText = "";
                    for (int i=0 ; i<originalText.length();i++)
                    {
                        fakeText += '*';
                    }
                }
            }
            setText(fakeText);
            super.paint(graphics);
            setText(originalText);
        }
    }

passwordTextField password = new passwordTextField();
add(password);

 static boolean flag = false;
public void fieldChanged(Field field, int context)
{
        if(showPasswordCheckbox.getChecked() == true)
	{
	   flag = true;
	}
	else
	{
	   flag = false;
	}
}