The last link in what you posted appears to be the way.
But, I would suggest you to read the article at Technet titled "Drillthrough, Drilldown, Subreports, and Nested Data Regions (Report Builder 3.0 and SSRS)". It talks about adding a Drillthrough, Sub Report or a Nested data region.
Click the following link to read more about this. In particular, visit the "InThisSection". It has links to each one of the methods described above.
And the following link in particular talks about Creating a drilldown report.