Smartforms: Printing Stub or Wide Footer at the Bottom of the Last Page

Suppose we need to create a Smartforms with a stub or wide footer that will appear only at the bottom of the last page.

One of the way is by adding a window for the stub or footer area at the bottom of the page just like below figure and append a condition that the window will only appear on the last page (only after end of Main Window).This is the easiest way and should already cater for all cases including whether all item data in the main window will sufficiently printed in 1 page or it will need more pages. Howerver, the drawback is, when stub requires a wide space, it will leave significant blank space at the bottom of each page before the last one.

Adding a window for the stub leaves unnecessary blank area at the bottom

Now, how can we remove the unnecessary blank areas and save more papers (and trees and forests)?