Re: How to update JComboBox without Selected Item being changed

Hello,
I want to periodically update a Combobox due to changes in the OS
(available RS232 serial ports).
I started to fill the box every time the combobox becomes visible

setup_cbport.removeAllItems();
while () {
  ...
  setup_cbport.addItem(portId.getName());
  ...
}
setup_cbport.setSelectedItem(port); // previously selected item

But when the box is being filled, an actionPerformed is fired

public void actionPerformed(ActionEvent e) {
if (e.getSource()==setup_cbport) {
  Object obj=setup_cbport.getSelectedItem();
  port=(String)obj; // new selection
}

and the previous selected item is overwritten.

I could compare the items in the box with the new items and
'add'/'remove' individually but this would complicated the code. I
would like a simple solution, e.g. to allow the new selection only when
the user changes the ComboBox, not when the 'actionPerformed' is issued
by the System.
Any ideas?

Juergen