Claudio,
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>I'd like to know something: I have a lot of papers in custom sizes to print in a dot-matrix printer. I know that I can set the custom paper of the printer to fill my needs. But what can I do in this case, where I have a lot of different sizes of papers?
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>There's some way to set this properties (length, width) programmaticatly, in runtime, before I send the report to printer?

There is a EXPR field in the report table. Within this field you can actually set the papersize at runtime, by changing the PAPERSIZE= line. You've to figure out which formats applies to your different sized papers.

If you set this value to 256 you can define the lenght and width with the PAPERLENGTH and PAPERWIDTH settings.

Good luck,

Walter,