What exactly do you mean by "screened box on a form"? Please elaborate and take into consideration that we are no native English speakers. What edition of VPE are you using?
When drawing a form, You want a column to have shaded background. so that the column or heading stands out. Very common on pre-printed forms. No problem with drawing a box, want a screened/shaded background.
From what I see, set the background color to a light gray, the pensize = 0 and then call the Box() method (DLL: VpeBox) and paint a grey box without a border (pensize = 0). Afterwards you can paint text on top of it.