About: http://webisa.webdatacommons.org/34584703

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The only thing I have been able to find that might be a clue is that because these buttons are set to owner draw (due to a bitmap being placed on them) there is a notify property that becomes disbled.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com