JPopupMenu doesn't show up

Hi all
I'm using a popup to work like a combobox in an applet. it works fine on my machine, but i think it's because i have java 1.4 installed. the standart jre in our company is 1.3, and in this version the popup doesn't show up. any ideas?
my code:
popup = new JPopupMenu();
JPanel popPanel = new JPanel();
ok = new JButton("Ok");
popPanel.setLayout(new BorderLayout());
popPanel.add("Center",calendar);
popPanel.add("South",ok);
popup.add(popPanel);and when it has to show up
popup.show(this,0,0); \\ this is an extended JComponenti also tried with popup.setDefaultLightWeightPopupEnabled(false); but there was no difference
and does anyone know, how i can get rid of the text 'Java Applet Window' below the popup?
thanks for help

ok, i found out, that it doesn't appear, when its defined lightweight.. how can set the JPopupMenu heavyweight??
like i read in other threads the method
popup.setDefaultLightWeightPopupEnabled(false);
doesn't work properly!

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