Workaround:
Public Class MyLocalMapProvider
    Inherits LocalMapProvider

    Public Overrides Sub ViewportChanged(viewport As IMapViewport, action As ViewportChangeAction)
        If Not Me.Initialized Then
            Me.Initialize()

            Return
        End If

        Dim tilesToDraw As List(Of MapVisualElement) = DirectCast(Me.GetType().BaseType.GetField("tilesToDraw", BindingFlags.Instance Or BindingFlags.NonPublic).GetValue(Me), List(Of MapVisualElement))

        Dim numOfTilesX As Integer = CInt(Math.Ceiling(CDbl((viewport.ViewportInPixels.Width)) / Me.TileSize.Width)) + 2
        Dim numOfTilesY As Integer = CInt(Math.Ceiling(CDbl((viewport.ViewportInPixels.Height)) / Me.TileSize.Height)) + 2
        Dim maxNumberOfTilesY As Integer = If((viewport.ZoomLevel = 1), 2, (viewport.ZoomLevel - 1) << 2)
        numOfTilesY = Math.Min(numOfTilesY, maxNumberOfTilesY)

        Dim topLeftTile As Point = MapTileSystemHelper.PixelXYToTileXY(-viewport.PanOffset.Width, -viewport.PanOffset.Height)

        Dim numberOfTiles As Integer = 2 << (viewport.ZoomLevel - 1)
        Dim startX As Integer = CInt(viewport.PanOffset.Width) Mod Me.TileSize.Width
        Dim startY As Integer = CInt(viewport.PanOffset.Height) Mod Me.TileSize.Height

        If startX > 0 Then
            startX -= Me.TileSize.Width
        End If

        For i As Integer = 0 To numOfTilesY - 1
            For j As Integer = 0 To numOfTilesX - 1
                Dim x As Integer = startX + j * Me.TileSize.Width
                Dim y As Integer = startY + i * Me.TileSize.Height

                Dim tileX As Integer = (topLeftTile.X + j) Mod numberOfTiles
                Dim tileY As Integer = (topLeftTile.Y + i) Mod numberOfTiles

                If tileX < 0 Then
                    tileX += numberOfTiles
                End If

                tilesToDraw.Add(New MapTile(Me.GetTileImage(tileX, tileY, viewport.ZoomLevel), New Rectangle(New Point(x, y), Me.TileSize)))
            Next
        Next
    End Sub
End Class

How to reproduce: Change the current culture so that a comma is used as a decimal separator, the Elevations example will fail with a (400) Bar Request error.

Workaround: create a custom BingRestMapProvider class
public class CustomBingRestMapProvider : BingRestMapProvider
    {
        protected override string GetPointsString(List<PointG> points)
        {
            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < points.Count; i++)
            {
                PointG point = points[i];

                if (i > 0)
                {
                    sb.Append(",");
                }

                sb.Append(point.Latitude.ToString(CultureInfo.InvariantCulture) + "," + point.Longitude.ToString(CultureInfo.InvariantCulture));
            }

            return sb.ToString();
        }
    }

To reproduce:
- Use a DataTable as a data source for SqlGeospatialDataReader.
- An exception will occur.

Workaround:
Convert the data table to a simple list of custom objects.

Until released use the following custom implementation:
public partial class RoadOnDemandForm : RadForm
{
    public RoadOnDemandForm()
    {
        InitializeComponent();

        string cacheFolder = @"..\..\cache";
        BingRestMapProvider bingProvider = new MyBingRestMapProvider();
        bingProvider.Culture = System.Threading.Thread.CurrentThread.CurrentCulture;
        bingProvider.ImagerySet = ImagerySet.Road;
        bingProvider.UseSession = true;
        bingProvider.BingKey = "YourApiKey";

        LocalFileCacheProvider cache = new LocalFileCacheProvider(cacheFolder);
        bingProvider.CacheProvider = cache;

        this.radMap1.MapElement.Providers.Add(bingProvider);
    }
}

public class MyBingRestMapProvider : BingRestMapProvider
{
    private const string ImageryMetadataServiceUri = "https://dev.virtualearth.net/REST/v1/Imagery/Metadata/{set}?output=json&key={key}&c={culture}&dir={directory}";

    protected override void InitializeImageryService()
    {
        typeof(BingRestMapProvider).GetField("tileMetadataInfo", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).SetValue(this, null);

        try
        {
            string uriString = ImageryMetadataServiceUri;
            uriString = uriString.Replace("{set}", "RoadOnDemand");
            uriString = uriString.Replace("{key}", string.IsNullOrEmpty(this.SessionId) ? this.BingKey : this.SessionId);
            uriString = uriString.Replace("{culture}", this.Culture.ToString());
            uriString = uriString.Replace("{directory}", "0");

            WebClient client = new WebClient();
            client.DownloadStringCompleted += this.InitializeImageryMetadataCompleted;
            client.DownloadStringAsync(new Uri(uriString, UriKind.Absolute));
        }
        catch (Exception ex)
        {
            throw new Exception(string.Format("Imagery Service Exception: {0}", ex.Message));
        }
    }
}

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;
     }
 }

Error:

System.ArgumentException was unhandled
  HResult=-2147024809
  Message=An item with the same key has already been added.
  Source=mscorlib
  StackTrace:
       at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
       at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
       at Telerik.WinControls.UI.DbfHeader.CreateExtendedPropertySet()
       at Telerik.WinControls.UI.DbfReader..ctor(Stream stream, ExtendedPropertySet propertySet, Encoding encoding)
       at Telerik.WinControls.UI.ShapeFileReader.Read(ShapeFileReaderParameters parameters)
       at _1125357MapShapeFiles.RadForm1..ctor() in d:\Projects\1125357MapShapeFiles\RadForm1.cs:line 37
       at _1125357MapShapeFiles.Program.Main() in d:\Projects\1125357MapShapeFiles\Program.cs:line 17
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

You can find attached a sample project, video, demonstrating the steps and a screenshot of the error.

Workaround:

public class MyMapVisualElementFactory : MapVisualElementFactory
{
    public override MapVisualElement CreatePolyline(Collection<PointG> points)
    {
        return new MyMapPolyline(points);
    }
}

public class MyMapPolyline : MapPolyline
{
    private FieldInfo pathsField;
    private FieldInfo boundingRectsField;
    private FieldInfo isInViewportField;

    public MyMapPolyline(Collection<PointG> points) : base(points)
    {
        this.pathsField = typeof(MapPolyline).GetField("paths", BindingFlags.Instance | BindingFlags.NonPublic);
        this.boundingRectsField = typeof(MapPolyline).GetField("boundingRects", BindingFlags.Instance | BindingFlags.NonPublic);
        this.isInViewportField = typeof(MapPolyline).GetField("isInViewport", BindingFlags.Instance | BindingFlags.NonPublic);
    }

    public override void ViewportChanged(IMapViewport viewport, ViewportChangeAction action)
    {
        if ((action & ViewportChangeAction.All) == action) 
        {
            long mapSize = MapTileSystemHelper.MapSize(viewport.ZoomLevel);
            List<GraphicsPath> paths = new List<GraphicsPath>();
            List<RectangleL> boundingRects = new List<RectangleL>();

            long start = viewport.PanOffset.Width;
            int maxWraparounds = 1;

            while (start + mapSize < viewport.ViewportInPixels.Width)
            {
                maxWraparounds++;
                start += mapSize;
            }

            for (int i = -1; i <= maxWraparounds; i++)
            {
                GraphicsPath path = new GraphicsPath();

                List<PointF> drawPoints = new List<PointF>();

                foreach (PointG p in this.Points)
                {
                    PointL pixel = MapTileSystemHelper.LatLongToPixelXY(p.Latitude, p.Longitude, viewport.ZoomLevel);
                    drawPoints.Add(new PointF(pixel.X + i * mapSize, pixel.Y));
                }

                path.AddLines(drawPoints.ToArray());

                RectangleF rect = path.GetBounds();
                RectangleF view = new RectangleF(viewport.ViewportInPixels.X, viewport.ViewportInPixels.Y, 
                    viewport.ViewportInPixels.Width, viewport.ViewportInPixels.Height);

                if (rect.IntersectsWith(view))
                {
                    paths.Add(path);
                }

                boundingRects.Add(new RectangleL((long)rect.X, (long)rect.Y, (long)rect.Width, (long)rect.Height)); 
            }

            this.pathsField.SetValue(this, paths);
            this.boundingRectsField.SetValue(this, boundingRects);
        }

        if (action != ViewportChangeAction.None)
        {
            this.isInViewportField.SetValue(this, false);
            List<RectangleL> boundingRects = this.boundingRectsField.GetValue(this) as List<RectangleL>;

            foreach (RectangleL rect in boundingRects)
            {
                if (viewport.ViewportInPixels.IntersectsWith(rect))
                {
                    this.isInViewportField.SetValue(this, true);
                }
            }
        }
    }
}

public class MyMapVisualElementFactory : MapVisualElementFactory
{
    public override MapVisualElement CreatePolyline(Collection<PointG> points)
    {
        return new MyMapPolyline(points);
    }
}

public class MyMapPolyline : MapPolyline
{
    private FieldInfo pathsField;
    private FieldInfo boundingRectsField;
    private FieldInfo isInViewportField;

    public MyMapPolyline(Collection<PointG> points) : base(points)
    {
        this.pathsField = typeof(MapPolyline).GetField("paths", BindingFlags.Instance | BindingFlags.NonPublic);
        this.boundingRectsField = typeof(MapPolyline).GetField("boundingRects", BindingFlags.Instance | BindingFlags.NonPublic);
        this.isInViewportField = typeof(MapPolyline).GetField("isInViewport", BindingFlags.Instance | BindingFlags.NonPublic);
    }

    public override void ViewportChanged(IMapViewport viewport, ViewportChangeAction action)
    {
        if ((action & ViewportChangeAction.All) == action) 
        {
            long mapSize = MapTileSystemHelper.MapSize(viewport.ZoomLevel);
            List<GraphicsPath> paths = new List<GraphicsPath>();
            List<RectangleL> boundingRects = new List<RectangleL>();

            long start = viewport.PanOffset.Width;
            int maxWraparounds = 1;

            while (start + mapSize < viewport.ViewportInPixels.Width)
            {
                maxWraparounds++;
                start += mapSize;
            }

            for (int i = -1; i <= maxWraparounds; i++)
            {
                GraphicsPath path = new GraphicsPath();

                List<PointF> drawPoints = new List<PointF>();

                foreach (PointG p in this.Points)
                {
                    PointL pixel = MapTileSystemHelper.LatLongToPixelXY(p.Latitude, p.Longitude, viewport.ZoomLevel);
                    drawPoints.Add(new PointF(pixel.X + i * mapSize, pixel.Y));
                }

                path.AddLines(drawPoints.ToArray());

                RectangleF rect = path.GetBounds();
                RectangleF view = new RectangleF(viewport.ViewportInPixels.X, viewport.ViewportInPixels.Y, 
                    viewport.ViewportInPixels.Width, viewport.ViewportInPixels.Height);

                if (rect.IntersectsWith(view))
                {
                    paths.Add(path);
                }

                boundingRects.Add(new RectangleL((long)rect.X, (long)rect.Y, (long)rect.Width, (long)rect.Height)); 
            }

            this.pathsField.SetValue(this, paths);
            this.boundingRectsField.SetValue(this, boundingRects);
        }

        if (action != ViewportChangeAction.None)
        {
            this.isInViewportField.SetValue(this, false);
            List<RectangleL> boundingRects = this.boundingRectsField.GetValue(this) as List<RectangleL>;

            foreach (RectangleL rect in boundingRects)
            {
                if (viewport.ViewportInPixels.IntersectsWith(rect))
                {
                    this.isInViewportField.SetValue(this, true);
                }
            }
        }
    }
}

To reproduce:
- Create a shape with QGIS and add it to RadMap using the approach described in the documentation: http://docs.telerik.com/devtools/winforms/map/file-readers/esri-shapefile-reader

https://msdn.microsoft.com/en-us/library/ff701717.aspx

How to reproduce: change the Windows culture to Greek and start the OSM example

How to reproduce: check the attached video

Workaround: create a custom MapSearchBarElement
public class MyRadMap : RadMap
{
    public override string ThemeClassName
    {
        get
        {
            return typeof(RadMap).FullName;
        }
    }
 
    protected override RadMapElement CreateMapElement()
    {
        return new MyRadMapElement();
    }
}
 
public class MyRadMapElement :  RadMapElement
{
    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadMapElement);
        }
    }
 
    protected override MapSearchBarElement CreateSearchBarElement()
    {
 
        return new MyMapSearchBarElement(this);
    }
}
 
public class MyMapSearchBarElement : MapSearchBarElement
{
    public MyMapSearchBarElement(MyRadMapElement mapElement)
        : base(mapElement)
    { }
 
    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(MapSearchBarElement);
        }
    }
 
    protected override void SearchProviderSearchError(object sender, SearchErrorEventArgs e)
    {
        IMapSearchProvider provider = sender as IMapSearchProvider;
        provider.SearchCompleted -= SearchProviderSearchCompleted;
        provider.SearchError -= SearchProviderSearchError;
 
        if (this.ElementTree != null)
        {
            UnsubscribeToTextBoxEvents(this.SearchTextBoxElement);
            RadMessageBox.SetThemeName(this.ElementTree.ThemeName);
            RadMessageBox.Show(e.Error.Message);
            SubscribeToTextBoxEvents(this.SearchTextBoxElement);
        }
    }
 
    protected override void SubscribeToTextBoxEvents(RadTextBoxElement textBox)
    {
        textBox.TextChanged += OnSearchTextBoxTextChanged;
        textBox.KeyDown += OnSearchTextBoxKeyDown;
    }
 
    protected override void UnsubscribeToTextBoxEvents(RadTextBoxElement textBox)
    {
        textBox.TextChanged -= OnSearchTextBoxTextChanged;
        textBox.KeyDown -= OnSearchTextBoxKeyDown;
    }
 
    private void OnSearchTextBoxKeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            this.Search(this.SearchTextBoxElement.Text);
        }
    }
}

In the scenario below one should be able to access the defined UserData value in the SearchCompleted event handler

How to reproduce:
protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            this.radMap1.ShowSearchBar = true;
            BingRestMapProvider bingProvider = this.radMap1.Providers[0] as BingRestMapProvider;
            this.radMap1.MapElement.SearchBarElement.SearchProvider = bingProvider;

            this.radMap1.MapElement.SearchBarElement.SearchProvider.SearchCompleted += BingProvider_SearchCompleted;
        }

        private void BingProvider_SearchCompleted(object sender, SearchCompletedEventArgs e)
        {
            Telerik.WinControls.UI.Map.RectangleG allPoints = new Telerik.WinControls.UI.Map.RectangleG(double.MinValue, double.MaxValue, double.MaxValue, double.MinValue);
            this.radMap1.Layers["Pins"].Clear();
            foreach (Telerik.WinControls.UI.Map.Bing.Location location in e.Locations)
            {
                Telerik.WinControls.UI.Map.PointG point = new Telerik.WinControls.UI.Map.PointG(location.Point.Coordinates[0], location.Point.Coordinates[1]);
                MapPin pin = new MapPin(point);
                pin.Size = new System.Drawing.Size(20, 40);
                pin.BackColor = Color.Red;
                pin.ToolTipText = location.Address.FormattedAddress;
                this.radMap1.MapElement.Layers["Pins"].Add(pin);
                allPoints.North = Math.Max(allPoints.North, point.Latitude);
                allPoints.South = Math.Min(allPoints.South, point.Latitude);
                allPoints.West = Math.Min(allPoints.West, point.Longitude);
                allPoints.East = Math.Max(allPoints.East, point.Longitude);
            }
            if (e.Locations.Length > 0)
            {
                if (e.Locations.Length == 1)
                {
                    this.radMap1.BringIntoView(new Telerik.WinControls.UI.Map.PointG(e.Locations[0].Point.Coordinates[0], e.Locations[0].Point.Coordinates[1]));
                }
                else
                {
                    this.radMap1.MapElement.BringIntoView(allPoints);
                    this.radMap1.Zoom(this.radMap1.MapElement.ZoomLevel - 1);
                }
            }
            else
            {
                RadMessageBox.Show("No result found for the provided search query!");
            }
        }

        Telerik.WinControls.UI.Map.Bing.SearchRequest request;
        private void radButton1_Click(object sender, EventArgs e)
        {
            Telerik.WinControls.UI.MapLayer pinsLayer = new MapLayer("Pins");
            this.radMap1.Layers.Add(pinsLayer);

            request = new SearchRequest();
            request.Query = "San Marino";
            request.SearchOptions.Count = 10;
            request.SearchOptions.QueryParse = true;
            request.UserData = "Tooltip";
            BingRestMapProvider bingProvider = this.radMap1.Providers[0] as BingRestMapProvider;
            bingProvider.SearchAsync(request);
        }

Workaround:  if possible cache the data to be accessed at a later stage

A sample for the required functionality:
public void AddMarker(RadMap Map)
{
    SearchRequest r = new SearchRequest();
    r.Query = "Paris, France";
    r.UserData = new Guid();           
    bingProvider.SearchCompleted += BingProvider_SearchCompleted;
    bingProvider.SearchAsync(r);
}

private void BingProvider_SearchCompleted(object sender, SearchCompletedEventArgs e)
{
    //one cannot access the UserData here
}

1. Open the demo application >> Map >> Search example.
2. Enter some text and press Enter.
3. Move the mouse a little bit and you will notice the search box looses focus.

Workaround:  this.radMap1.MapElement.SearchBarElement.SearchTextBoxElement.TextBoxItem.LostFocus+=TextBoxItem_LostFocus;

        private void TextBoxItem_LostFocus(object sender, EventArgs e)
        {
            this.radMap1.MapElement.SearchBarElement.SearchTextBoxElement.TextBoxItem.TextBoxControl.Focus();
        }