As it is designed, I can create a table of content by pressing F9 in TOC area. Unless I tell the users to press F9, most of the users wouldn't know how to create TOC. So, I was wondering if there is a way to display a message in TOC area and have it deleted when F9 is pressed? For example, I want to display a message saying "Hightlight this sentence and press F9 to create TOC." After I place this message in TOC area and press F9, the TOC is generated, but the message is still in the position. Is there a way to delete a sentence in Aspose?