Hi Rieni De Rijke,
You can draw a square on the information layer using mouse events of the map control. The top-left and the bottom-right coordinates of the square you can get using the GeographicalBounds property of the MapRectangle instance.
I have attached a sample solution. I hope it helps.
the Telerik team
See What's New in RadControls for WPF in Q3 2010 on Tuesday, November 16, 2010 11:00 AM - 12:00 PM EST or 10:00 PM - 11:00 PM EST: Register here>>