Last Updated: 22 Jan 2020 12:34 by ADMIN
Release LIB 2020.1.127 (01/27/2020)
'Cannot find resource named 'DragVisualStyle' error occurs in in the error list when using implicit styles.
Last Updated: 20 Jan 2020 07:21 by ADMIN
Release LIB 2020.1.120 (1/20/2020)



I've found a new bug regarding per-monitor DPI awareness in the latest WPF controls build (2020.1.115).

Applications start fine on the modern Windows 10 systems (1607 or later) but crash on previous Windows versions.

The conditions to reproduce:

  • The application is launched on Windows version older than Windows 10 1607/Windows Server 2016. I've reproduced it on Windows 8.1/Windows Server 2012 R2, but I suppose it also affects Windows 10 1507/1511, and probably Windows 8/Windows Server 2012.
  • Application manifest contains:
<dpiAware xmlns="">true/PM</dpiAware>

Here is the stack trace:

System.EntryPointNotFoundException: Unable to find an entry point named 'GetDpiForSystem' in DLL 'User32.dll'.

   at Telerik.Windows.Controls.InternalWindow.Standard.NativeMethods.GetDpiForSystem()

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.GetSystemScaleFactor()

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.CalculateScaleFactor(IntPtr hwnd)

   at Telerik.Windows.Controls.InternalWindow.Standard.DpiHelper.GetPerMonitorDPIAwareScaleFactor(IntPtr hwnd)

   at Telerik.Windows.Controls.InternalWindow.ChromelessWindowHelper.<Initialize>b__81_0(Object sender, EventArgs args)

   at System.Windows.Window.OnSourceInitialized(EventArgs e)

   at System.Windows.Window.CreateSourceWindow(Boolean duringShow)

   at System.Windows.Window.CreateSourceWindowDuringShow()

   at System.Windows.Window.SafeCreateWindowDuringShow()

   at System.Windows.Window.ShowHelper(Object booleanBox)

   at System.Windows.Window.Show()

   at Telerik.Windows.Controls.InternalWindow.WindowWithNoChromeWindowHost.Open(Boolean isModal)

   at Telerik.Windows.Controls.WindowBase.ShowWindow(Boolean isModal)

   at Telerik.Windows.Controls.RadWindow.Show()

   at TelerikWpfCrash.App.OnStartup(StartupEventArgs e) in C:\Users\fedarovich\source\repos\Test\TelerikWpfCrash\TelerikWpfCrash\App.xaml.cs:line 20

The issue happens because the code calls the WinAPI functions not available on these OS versions (for example, GetDpiForSystem, but maybe there are more). 

I've attached a small example to reproduce this issue. It is for .Net Core 3.1, but the same issue exists in .Net Framework too.

Last Updated: 20 Jan 2020 08:03 by ADMIN
Release LIB 2020.1.120 (01/20/2020)

Steps to reproduce:

1. Create a form with a webcam that calls Close and Dispose when closed.

2. Create a second form with a button that shows the first form.

3. Run the project and you will see an exception when closing the webcam form.

Last Updated: 10 Jan 2020 14:09 by ADMIN
Release R1 2020

Recently OpenStreetMap changed their tile usage policy and require UserAgent string in the web headers for accessing tiles.

As a result, standard open street map mode does not work - no tiles are loaded and "too many requests" error is returned from the server.

RadMap's OpenStreetMapProvider needs API (event, property or similar) for easier set up of UserAgent / Referer / other headers of web requests.

Currently, the workaround is to override the OpenStreetMapProvider like so:

    public class CustomOpenStreetProvider : OpenStreetMapProvider
        public CustomOpenStreetProvider()
            OpenStreetMapnikSource osmMapInkSource = this.MapSources.Values.ToList()[0] as OpenStreetMapnikSource;
            if (osmMapInkSource != null)
                osmMapInkSource.WebHeaders.Add(System.Net.HttpRequestHeader.UserAgent, "your custom user agent string");
Last Updated: 22 Jan 2020 08:04 by ADMIN
Release LIB 2020.1.127 (01/27/2020)
Whitespaces are ignored when copy-pasting from PdfViewer to another text redactor.
Last Updated: 18 Dec 2019 06:10 by ADMIN
Release Lib 2019.3.1223
Clicking on the hyperlink does not open the link in .Net Core.
Last Updated: 20 Jan 2020 12:40 by ADMIN
Release LIB 2020.1.120

    I found a bug when use MergeCells in grid view and tree list view, I am the license account, my support is out of date,But I still want to feadback the bug to you , I make a vedio in attachment

When use in radtreelistview , I can not explict set the MergedCellsStyle, maybe MergedCellsStyleSelector also have the bug.I just try MergedCellsStyle.

Last Updated: 17 Dec 2019 14:08 by ADMIN
Release LIB 2019.3.1223

The VisualStudio2019 ChartPalette (from Telerik.Windows.Controls.ChartView) throws the below exception when using the Telerik .NET Core assemblies. This does not occur when using the Telerik .NET Framework assemblies.

System.IO.IOException: 'Cannot locate resource 'visualization/palettes/resources/visualstudio2019.xml'.'
   at MS.Internal.AppModel.ResourcePart.GetStreamCore(FileMode mode, FileAccess access)
   at System.IO.Packaging.PackagePart.GetStream(FileMode mode, FileAccess access)
   at MS.Internal.IO.Packaging.PackagePartExtensions.GetSeekableStream(PackagePart packPart, FileMode mode, FileAccess access)
   at MS.Internal.IO.Packaging.PackagePartExtensions.GetSeekableStream(PackagePart packPart)
   at System.Windows.Application.GetResourceStream(Uri uriResource)
   at Telerik.Windows.Controls.ChartView.ChartPalettes.LoadPalette(String fileName)
   at Telerik.Windows.Controls.ChartView.ChartPalettes.get_VisualStudio2019()

Last Updated: 13 Dec 2019 13:36 by ADMIN
You can show the shortcuts by adding a Filter, however in the MS dialogs they are visible by default. 
Last Updated: 10 Dec 2019 14:55 by ADMIN
When a link to a folder is selected and the Open button is clicked, the RadOpenFileDialog does not navigate to that folder. 
Last Updated: 04 Dec 2019 11:40 by ADMIN
Release LIB 2019.3.1209 (12/09/2019)

When the ItemsSource is not set: ArgumentOutOfRangeException is thrown

When the ItemsSource is set to an empty collection: DivideByZeroException is thrown

Last Updated: 03 Dec 2019 11:22 by ADMIN
Created by: Dinko
Comments: 0
Category: Map
Type: Bug Report
Missing MapOsmCycleCommand resource key in French. All resource keys will be check for the correct spelling.
Last Updated: 26 Nov 2019 09:58 by ADMIN
Release LIB 2019.3.1202

Steps to reproduce:

1. Place a camera on a window

2. Have no camera plugged in the PC

3. Call the Start or Stop method

Expected behaviour: Nothing 

Actual behaviour: An exception is thrown

Last Updated: 25 Nov 2019 10:00 by ADMIN
Release LIB 2019.3.1125 (11/25/2019)
This exception is thrown when the CanExecute method of the Command bound to a response button returns false when the response button key is pressed. 
Last Updated: 15 Dec 2019 11:48 by ADMIN

When the control is declared in XAML, and we place the caret somewhere on the control the VS designer is open, and the dropdown is open.

Last Updated: 25 Nov 2019 12:03 by ADMIN
Release LIB 2019.3.1125

Drag and drop from Visual Studio Toolbox to the designer area doesn't allow you to drop the corresponding control inside the content of the selected tab item. 

To work this around, add a Grid panel with transparent background inside the RadTabItem's in XAML. You can do this also  through the toolbox.

 <telerik:RadTabItem x:Name="RadTabItem1" Header="Tab item 1">
	<Grid Background="Transparent" />

Last Updated: 15 Nov 2019 14:03 by ADMIN
Release LIB 2019.3.1118
A NullReferenceException is thrown after opening the dropdown and there is an implicit style targeting RadGridView which sets the SearchMode property.
Last Updated: 13 Nov 2019 15:50 by ADMIN
Release LIB 2019.3.1118
The Window doesn't resize correctly when dragged from the primary monitor (with taskbar) and docked to the top of the screen of a secondary monitor (no taskbar) in order to maximize it and "Show window contents while dragging" Windows system setting is disabled.
Last Updated: 18 Nov 2019 11:55 by ADMIN
Release LIB 2019.3.1118 (11/18/2019)
Dropdown does not close when OpenDropDownOnFocus is True and KeepDropDownOpen is False and the user has previously made a selection after opening the control by clicking on its textbox part.
Last Updated: 15 Nov 2019 09:28 by ADMIN
Release LIB 2019.3.1118

CurrenyInput with Indian Culture. Value is 123456789.

Controls shows: "₹ 1,234,56,789.00"

Expected is : "₹ 12,34,56,789.00"

1 2 3 4 5 6