If at all it is printing on the browser then obviously the report will appear on the browser, It's COM.
If this is the case then the javascript
//This can make automatically print a
doc on the client side;
//Never tried but can you insert this HTML in the output which is pdf?
<script type="text/javascript">
if(window.print)
window.print()
else
alert("no printer found");
</script>
may be of no use; as the pdf is a independent component embedded on HTML, if at all we try using javascript then it cannot completely print the document as it will just print the window I Guess...Never tried...