In List Widget, hitting of select/return/enter key doesnt call action Performed
on Win32 Platforms.

It results into actionEvent on double click of mouse.
As per specs, its shld result into actionEvent on return, too.

Also, the behavior of List Widget is inconsistent on different platforms.
Hitting return on Motif, results into deselecting of the last selected item,
Which seems to be erroneous.