private void addUserListValueChanged(ListSelectionEvent e) { ArrayList<PresenceInfo> selectedValues = addUserPanel.getSelectedValues(); setEnabledInviteButton(); setEnabledActionButton(); if (inProgressButtonPanel == null) { return; } for (PresenceInfo info : selectedValues) { if (info.getClientID() != null) { if (inProgressButtonPanel != null) { inProgressButtonPanel.setEnabledHangUpButton(false); } return; } } inProgressButtonPanel.setEnabledHangUpButton(true); }