[Dynamic Graphics] Attempt to fix intermittent test failure

Continuous build fails on testDropDowns sometimes, and other times not.
Build failure is not reproducable in developer environment.

This adjusts this test (which notes that the tested behavior is sensitive
to defaults) to make multiple changes, in an effort to ensure that
the desired behavior is triggered.
Merge pull request #159 from VWoeltjen/unitTestFix

[Dynamic Graphics] Attempt to fix intermittent test failure