Create a new WSDL File called echo.
Select the echo.
Right Mouse Button click and select Properties.
In the Properties window.

 Components with no LABEL_FOR pointing to it :
   Class: org.openide.explorer.propertysheet.SheetTable {  Properties table |  
Table of editable properties representing the current object } 

 Components not reachable with tab traversal :
   Class: org.openide.explorer.propertysheet.SheetTable {  Properties table |  
Table of editable properties representing the current object }