How to create a seperate popup window?

I am trying to create a popup window for my GUI system, and got the basics working. I just create a new GLWindow and add the following WindowListener to it, to keep it from losing focus:

public class PopupWindow extends GLWindow {

                public PopupWindow() {
                        // This constructor isn't public, that's why I have to inherit from GLWindow
                        super(NewtFactory.createWindow(existingCapabilitiesIStoreSomewhereElse));

                        this.addWindowListener(new WindowListener() {

                                @Override
                                public void windowLostFocus(WindowEvent e) {
                                        requestFocus();
                                }

                                //... other methods
                        });

                        setVisible(true);
                }
        }

As I said this works, but it isn't very pretty yet. Therefore, some questions:

Is it possible, to...
 - hide the popup window from the taskbar?
 - hide the maximize/minimize buttons or entirely disable the row of buttons at the top?
 - stop mouse events from reaching the main (not popup) window?
 - and have that blinking effect when the user tries to click on the unfocused main window?

I'm aware that's quite a lot of questions and am thankful for anyone who is willing to help me!
 

Hello

Some of your requirements are parts of requests for enhancement and aren't supported right now, especially the 2 first ones.