modification of print dialog

Thu Jan 30 06:05:22 PST 2014

Hello !
I faced with the following problem:
I need to launch an additional dialog box while user pushing the "Print" button: I would like to check if he has saved the document that he's trying to print in order to prevent the printing of the unsaved documents.  Are there any methods of the solution of this task without modification of a source code?

Yours truly, Alex.
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