🚀 go-pugleaf

I have a combo box that does not do what it is supposed to.

I have a JTree and a JComboBox.  I do a search on the tree based on what
the user types in the combo box.  If I find anything  on the tree that
matches the text typed in the combobox I add the items found to the
combo box.  In order to make the user aware of the items found, I want
to make the items found visible; therefore I thought that if I said,
JComboBox.setPopupVisible() it would work but it does not.  Is there a
different way to make the popup of the combobox to drop down?

Thanks for your help.

Alex.