Please correct me if I misunderstand your question.
Display Property
1. Select the element in question;
2. Position the Timeline Play-head where you want the to control (show/hide) the element;
3. Go to the Property Panel, at the very top change the 'Display' option to 'Off'; (See capture)
4. Move the Timeline Play-head to another position, go back to the same 'Display' option and set it to 'On';
Darrell