How to reproduce: public partial class Form3 : Form { public Form3() { InitializeComponent(); MapLayer pointLayer = new MapLayer("PointG"); pointLayer.ClusterStrategy = new ElementClusterStrategy(); pointLayer.ClusterDistance = 100; this.radMap1.Layers.Add(pointLayer); MapPin pin1 = new MapPin(new PointG(45d, 15d)) { BackColor = Color.Coral, ToolTipText = "Tool Tip1" }; MapPin pin2 = new MapPin(new PointG(44d, 18d)) { BackColor = Color.Coral, ToolTipText = "Tool Tip2" }; this.radMap1.Layers["PointG"].Add(pin1); this.radMap1.Layers["PointG"].Add(pin2); this.SetupProviders(); } private void radMap1_ToolTipTextNeeded(object sender, Telerik.WinControls.ToolTipTextNeededEventArgs e) { MapCluster cluster = sender as MapCluster; if (cluster != null && cluster.ClusteredItems.Count == 1) { cluster.ToolTipText = ((MapPin)cluster.ClusteredItems[0]).ToolTipText; } } private void SetupProviders() { string cacheFolder = @"..\..\cache"; BingRestMapProvider bingProvider = new BingRestMapProvider(); bingProvider.Culture = System.Threading.Thread.CurrentThread.CurrentCulture; bingProvider.ImagerySet = ImagerySet.Road; bingProvider.UseSession = true; bingProvider.BingKey = "..."; LocalFileCacheProvider cache = new LocalFileCacheProvider(cacheFolder); bingProvider.CacheProvider = cache; this.radMap1.MapElement.Providers.Add(bingProvider); bingProvider.InitializationComplete += bingProvider_InitializationComplete; } private void bingProvider_InitializationComplete(object sender, EventArgs e) { this.radMap1.BringIntoView(new PointG(45d, 15d), 5); } } Workaround: handle the ToolTipNeededEvent private void radMap1_ToolTipTextNeeded(object sender, Telerik.WinControls.ToolTipTextNeededEventArgs e) { MapCluster cluster = sender as MapCluster; if (cluster != null && cluster.ClusteredItems.Count == 1) { cluster.ToolTipText = ((MapPin)cluster.ClusteredItems[0]).ToolTipText; } }