Add support for map grid (i.e. grid-lines).

The MapShapeBindableWrappers such as the MapPolylineView should support binding to properties like the Visibility property.

If I have a list a RadObservableCollectio<Route> and I clear the collection, routes disappear form the map, but if I remove them one by one, they stay on the map at all times, even are clickable and all. 

When the clustering is enabled in the visualization layer and the location of map item is changed dynamically then the item disappears if it is a single item (not within a cluster).

The problem happens in the VisualizationLayer when map is zoomed in on a shape with the stroke thickness set. The stroke doesn't scale down until the map has stopped zooming. This creates an unwanted side effect where the borders of the shape can get really huge/thick while the user is zooming into the shape, and when the zooming stops, the borders jump down to thickness of 1. We should improve map shape visualization in the VisualizationLayer to avoid this side effect.

The RadMap does not release all resources by the Dispose method when it uses the BingMapProvider.

When the DBF-file has short length of record and it contains a few number of records then the AsyncShapeFileReader causes the following error: 'The DBF file is invalid or has unsupported format'.