how to use SetContentType()?

[Wiedmann]

Hello,

just a question about SetContentType() in "class.module.inc.php".

What I doing at the moment:

I have a file "action.bar.php" for my module..
In this action I set SetContenType to something and output some data

Now  call this  module action withe.g.  this link:
http://example.com/index.php?mact=Foo,c ... d=1&page=1

The result is:
- in "index.php" line 294 header() is using my 'content-type' which I have set in my action.
- I get the expected data in my browser (echo $html; line ~296).

But now there is some additional output (line ~309,311) which corrupt my data, because it's not valid for my 'content-type'.

Is the method SetContentType() designed for some other usage?

Regards,
Carsten