unregister();
if (fViewer instanceof IEditingSupportRegistry) {
IEditingSupportRegistry registry= (IEditingSupportRegistry) fViewer;
registry.unregister(fFocusEditingSupport);
}
if (Helper2.okToUse(fProposalShell)) {
fContentAssistant.removeContentAssistListener(this, ContentAssistant2.PROPOSAL_SELECTOR);