The "Problem in nested qdatagrid" is addressed here

See the http://qcu.be/content/problem-nested-qdatagrid for the problem explanation and the original patch.
With all the bugfixes merged in, the generated  type-table code was broken.
Add asterisk to the jQuery server side controls list in the examples index page.
Merge pull request #240 from vaibhav-kaushal/bug-jQuery-Controls-Server-Side-Wrappers-asterisk

Add asterisk to the jQuery server side controls list in the examples index page
Fix for the #241 issue

"qcheckboxcolumn example is broken" - double quotes were the cause of the problem.
Merge pull request #245 from olegabr/bug-241

Fix for the #241 issue
Merge pull request #223 from olegabr/bug-nestedQDatagridPagination

Bug in nested qdatagrid pagination fixed
Release version moved forward, changelog is updated
Merge pull request #247 from olegabr/rc-2.2.1

Release version moved forward, changelog is updated
Merge pull request #248 from qcubed/rc-2.2.1

The release version 2.2.1 is prepared
Merge pull request #250 from qcubed/bug-235

An asterix is added for an example title
Merge pull request #251 from qcubed/bug-241

The checkbox column example is fixed