Hi Antonio,
      I was going through the simple paint tutorial and came across
CD_IUPDBUFFER driver when using CD CreateCanvas. I could not find the
documentation for it on CD page. I was initializing my IUP canvas with CD
for double buffering in Map_CB like this:

 local cd_Canvas = cd.CreateCanvas(cd.IUP, iupcanvas)
local cd_bCanvas = cd.CreateCanvas(cd.DBUFFER,cd_Canvas)

I see with CD_IUPDBUFFER you don't need 2 of them. Please can you give some
info about this driver.

Thanks,
Milind
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