This might seem like a strange inquiry but I would like to know whether it 
  is possible to have an image (or a text) fill in the background of a chart. 
  The reason is that, as a trader, I like to have some text reminder in front of 
  my eyes before I take a trade (such as "don't forget to check this and 
  that...").
I didn't find such possibility, other than using the existing 
  "setchartbkcolor", and "gfxsetbkcolor", etc.
Could anyone help 
  here?
Thank you,
Carl