Discard annotations pdftron - Windows Store

Im trying to do a discard annotations button on a page that display a pdf and has a toolbar to add annotations.

I would like to have the option of after adding some annotations, the user could revert to the original file, removing all annotations he did.

I tried finding a variable that saved a list of the annotations made but haven’t found anything of sort.

Is there a way to discard all annotations made, or a place i can see the annotations that were created ?