Corners Solution

#numbers at the end represent where on the scrollbar they should be placed. In my case I went with a 6-wide scrollbar.
#The bitmaps are a single pixel in cyan(R=0,G=255,B=255) so they appear as the foreground colour set in .config.
%xl(corner1,ScrollTL.bmp,0,0)
%xl(corner2,ScrollTR.bmp,5,0)
%xl(corner3,ScrollBL.bmp,0,206)
%xl(corner4,ScrollBR.bmp,5,206)

#Draw a viewport over the scrollbar, then call on the 4 corners
%Vl(scrollcorners,301,30,6,207,-)
%xd(corner1)
%xd(corner2)
%xd(corner3)
%xd(corner4)