"Add New..." wizzard is missing "Test Case" option for "Auto Test Projects"

I would like to add a testcase to an "Auto Test Project".

The Wizard to create an "Auto Test Project" contains a page to create one test case.

I would like to have an option to add test cases to an "Auto Test Project".

Example:

I would like to have test cases for each class of a library.
The library contains two classes:

• foo
• bar.

The wizard for the "Auto Test Project" creation allows to add one testcase.
I choose foo. This will create a tst_foo.cpp file.
How can I add (with the help of the IDE) a tst_bar.cpp file for testing my library class bar?