Revert "fix test to be more reasonable.  It would be rare to see a discontiguous radiobutton group like this."

This reverts commit fe2a2ea3a1851e537c5d04527a24dcc0ac279f34.

We will attempt to handle discontiguous sets of radiobuttons.
require that all members of a FocusManagerGroup are in the same document.  This should alleviate the requirement that groupName is unique throughout the UI which will allow radiobutton templates in MXML and hopefully not break anybody's app
add png.xml files (temporarily, I think)
Revert "add png.xml files (temporarily, I think)"

This reverts commit 9254e66312a56f00fcd72a91623a1a4c4bf1b6d3.