Bug 18266 Turning off lightbulb preference doesn't turn the lights off right away
When you turn off the lightbulb preference, editors with existing lightbulbs continue to show them. Closing and reopening the editors gets rid of them.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavaEditorPreferencePage.java
addColorButton(contentAssistComposite, label, ContentAssistPreference.PARAMETERS_BACKGROUND, 0);
		
		label= JavaUIMessages.getString("JavaEditorPreferencePage.foregroundForMethodParameters"); 
		addColorButton(contentAssistComposite, label, ContentAssistPreference.PARAMETERS_FOREGROUND, 0);
		
		autoactivation.addSelectionListener(new SelectionAdapter(){
            public void widgetSelected(SelectionEvent e) {
            	updateAutoactivationControls();
            }
		});		
		return contentAssistComposite;
	}
	/*
	 * @see PreferencePage#createContents(Composite)
	 */
	protected Control createContents(Composite parent) {
		
		fOverlayStore.load();
		fOverlayStore.start();
		
		TabFolder folder= new TabFolder(parent, SWT.NONE);
		folder.setLayout(new TabFolderLayout());	
		folder.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		TabItem item= new TabItem(folder, SWT.NONE);
		item.setText(JavaUIMessages.getString("JavaEditorPreferencePage.general")); 
		item.setControl(createAppearancePage(folder));
		
		item= new TabItem(folder, SWT.NONE);
		item.setText(JavaUIMessages.getString("JavaEditorPreferencePage.colors"));