Revisit: How to Use the Timeline in a drop down menu

The tutorial on the drop down menu Timeline begins at 1:04 in the following Week #5 Video.
Video content includes the following:
• Insert an APDiv 2
• Add the graphics into the APDiv
• Resize the APDiv
• Drag the APDiv (from the APDiv handle) into the Timeline
• To shorten the time of the show, slide the right keyframe from frame 15 to frame 5
• Assign a Show-Hide Elements Behavior in the "B" Behavior channel of the Timeline to hide the APDiv on frame 5
• Assign Behaviors to the trigger graphic...