Created the build_main_box() method.
The main box in the automatic model-free frame is called sizer_14. Its creation now has been isolated and placed into build_main_box(). This method packs the box with the bitmap image and the right hand box called sizer_15 (not yet functional).
Authored by: bugman 2010-01-26
Parent: [r10354]
Child: [r10356]
