public void actionPerformed(ActionEvent evt) {
    if("removeFromQueue".equals(evt.getActionCommand())){

        System.out.println("removeFromQueue button clicked");

        if(empty()){
            JOptionPane.showMessageDialog(null, "Queue is empty! Good work.");
            return;
        }

        // Removes top of queue from screen
        MainFrame.activeQueue_.remove(queue.get(0));

        // Updates UI
        MainFrame.activeQueue_.revalidate();
        MainFrame.activeQueue_.repaint();

        resolved.add(queue.get(0)); // Adds to resolved tickets

        MainFrame.resolvedTickets_.add(resolved.get(resolved_COUNT));
        resolved_COUNT++;

        deleteFirst(); // Deletes from queue
    }
}