if (method == null || ! method.exists()) return false;
	private boolean shouldAcceptElement(IMethod method) {		try{			fRefactoring= new ModifyParametersRefactoring(method);			return fRefactoring.checkPreactivation().isOK();		} catch (JavaModelException e) {			// http://bugs.eclipse.org/bugs/show_bug.cgi?id=19253			if (JavaModelUtil.filterNotPresentException(e))				JavaPlugin.log(e); //this happen on selection changes in viewers - do not show ui if fails, just log			return false;		}		}