Sync openstreetmap markers and selected rows from advanced grid

I have a service that pulls data from a database and places the results in an InfoTable.

That InfoTable is then bound to an OpenStreetMap's Data property and to an advanced grid's Data Property.

I would like to select markers on the map as the user selects rows (multiple rows) from the grid...and vice versa...as a user selects multiple markers on the map, highlight the rows in the grid.

The advanced grid will pass the selected rows out as an info table.  

a.) How do I set a marker as selected in OpenStreetMap?

b.) How do I get the markers that have been selected in OpenStreetMap so I can select the matching rows in the grid?

Thanks!