Grazie,
If you follow the "flow" of the button properties menu, you'll more or less have it, starting from the top down. End actions can be set for a menu or for a video. Here's how I do it:
Drop all assets in the Project Properties window.
Create my buttons by either dragging from the project properties, or creating empty buttons via Insert>Empty button
In the button menu, you'll see broken links laid out in red.
Link the button there to a video that you'll see in the drop down menu.
Double click the linked video button. This opens the Media Properties Menu. In here, you'll see end actions. In the end action dropdown, select where you want the viewer to be transported/view after the video plays. You can also set in the Menu Properties, how long you'd like to have the menu play, and then go to XXX video as specified in the end action. Look at the various property pages on the right side of the application from the top down and use that as a working guide to the order that you accomplish these tasks.
HTH?