clear all history - not just selection and results

Anybody know how i can completely clear my history in GVS 2.3 - I can clear results and selections fine with commands (including ResultsListCommands.ClearResults() ) but my history stays populated and shows up as results if I run the workflow again.  E.g. each time I search for a parcel it adds it to the results list, I clear it from the results list and it's gone, but still shows in History - if I run that parcel search workflow again, it includes both the new parcel and the historical one - this goes on and on...

 

Windows Server 2008,SQL Server

 

GTX Essentials 4.3, SL Viewer 2.3

 

Results:

 

 

History: