Scaling-down a dialog when moved to another screen

[ssimop]

I am still trying to work-out a way to scale-down a window-dialog, designed in a PC with screen ample to accommodate a high dialog, to another PC with shorter screen, where this dialog is truncated at its bottom. I wonder whether a vertical scroll bar in this dialog could help. I cannot see any example with a vertical scroll bar. Any advice will be highly appreciated.