This for gavotte wsdl graphical editor.
The details of use case for this feature is located in WSDL Editor Functional
Spec (Gavotte) at:
Search for this bug number and look the description in "Detailed Use case"
This was implemented in release551 branch last month.
Verified on Windows XP with Gavotte 070111_20 and JDK 1.5.0_10.