This is what is happening in the movie(in case it is too quick).

1. We have the AutoResize of the background to true
2. We add a field by dragging it from the Tools Module
3. Set the fields Right anchor to right, the other values are filled in automatically by the module.
4. Duplicate the field and drag the second field down, leaving space for a divider.
5. The Bottom fields bottom anchor is set to bottom.
6. Drag a graphic from the tools palette.
7. Select the top field.
8. From the anchorData module choose the tilde (~) from the bottom anchor popup.
9. The cursor changes to a white pointer with a question mark. As we move this over the objects, objects that are higher in the stacking order (and can be 'hooked' onto) show there ids. clicking on one of these objects sets the bottom anchor, in this case to ~106
10. We set the top anchor of the bottom filed to ~106 too, hooking it to our divider.
11. The fields now resize with the window
12. We show the Dividers section of the AnchorData Module with the disclosure arrow.
13. The divider will now act as a divider, the first time it is dragged, its anchorData is set.
14. From the Divider Picture we can set the pictureData of a rect divider to a graphic indicating the divider is a divider. (We also set the showfill and showpen of the graphic to false from the PI, this is not shown)
15. Clicking on the Install Plugin button adds a graphic with the divider scripts to our project. The dividers will now function even if MPI is not used, say in a standalone. You can hide the graphic. A script is also installed into the project to install the script into the backscripts if MPI is not running.