Stitch to still frames from Camtasia motion screens

Is it possible to get a still frame from Camtasia recording of different parts of the frame. The only user action is clicks on the scroll bar to get to the bottom. Currently I have to manually stitch them together with Photoshop by using "Export Frame As" of each part in Camtasia.
Although I can capture scrolling window with SnagIt, it removed the scroll bar.
is there a more automated way to get a complete screen that requires multiple scrolls?
Thanks,