I'd like to add a button to the UI to allow a user to
see the statistics at any point.

What would the php code look like to invoke a call to generate
the stats window?

It looks like so much is embedded within one call to
generate_statistics() making it a little challenging to
modularize/customize it.

By statistics do you mean the statistics for the current question or the general public statistics (docs.limesurvey.org/Statistics&structure...=y#Public_Statistics)

Well, at least the current question...

That isn't possible without additional coding and hacking the source code.

That's what I thought. Can you perhaps suggest the easiest way to accomplish this?

Vielen Dank!

First have a look at docs.limesurvey.org/How+to+contribute+new+features because this feature will be useful to everybody.

Then I think a good first start is to have a look at qanda.php where you will find a function for each question type like "do_shorttext()" which creates the questions HTML. You can then add a new question attribute like "Show stats at question" (I think common.php or common_functions.php holds the question attribute data).
The at qanda.php if that attribute is enable, add some additional code. Code for generating tgraphs can be found at statistics_user.php and /admin/statistics.php and /admin/statistics_functions.php.

Thanks, I'll take a look at this...

paz, did you succeed to code this?