It's done in VB here:

http://www.mp2kmag.com/a46--find.from.radius.mappoint.html

mfrmMap.cmbPushpin.Clear


>I could really use some help on this one.
>
>How can I clear all the previous LOCATIONS and Pushpins on the map ? I need to clear the map for each trip, but they just keep accumlating until I release the Application object all together.
>
>According to the documentation, I think I should create the Dataset object, and then try to do Dataset.delete. But I can not create the right Dataset object. I have created the following objects:
>
>goMapApp = createobject("MapPoint.Application")
>goMap = goMapApp.ActiveMap
>goRoute = goMap.ActiveRoute
>goRoute.Clear() && this Gets rid of any existing waypoints.
>goDataSets = goMapapp.ActiveMap.DataSets
>
>
>Thanks in advance.