Hello,
We encountered problems with configuration of the toolbox in Visual Studio 2022 when out-of-proc designer is active.
More information about the usage and reason for the out-of-proc designer: https://github.com/dotnet/winforms/blob/main/docs/designer/designer-selection.md
Tested environment:
- Visual Studio 2022
- .NET Framework 4.7.1
- 32-bit application
- Windows 11 Pro
- Telerik UI For Winforms 2025.2.520.462
When trying to add a rad control from the toolbox the error in attachment occurs.
Workaround:
- Disable the out-of-proc designer in the project file:
<UseWinFormsOutOfProcDesigner>False</UseWinFormsOutOfProcDesigner>
Contrary to Telerik.WinControls.UI.Barcode.QRCode, Telerik.WinControls.UI.Barcode.Symbology.QRCode creates invalid (unscannable) QR-Codes if the message contains umlauts when using ECIMode.UTF8.
We are using Symbology.QRCode, because we use it in columns of a RadGridView.
I've attached two example QR-Codes of the value "Bär", one using Barcode.QRCode, and the other one using Barcode.Symbology.QRCode.
Note: I have one scanner that can scan some of the Barcode.Symbology QR-Codes with umlauts.
(This request may be specific to VS solutions which produce only DLLs, and not to ones which create a .exe.)
At the moment, the default behaviour for everything else in my VS project is to not produce warnings unless something might be wrong, which I may need to action.
WinForms,as of the latest release (2025) is the only thing which produces warning messages where there is not problem, which is not very tidy. I only want to see things in the build output which need my attention, defintely not 'happy' messages, or warnings which are not needed.
Currently, for each project in my solution, I get a message like:
1> [Telerik and Kendo UI Licensing]
1> Valid Telerik UI for WinForms license found. Make sure the main application also references Telerik.Licensing when using a class library.
...but I have a valid licence, and everything is OK. No action is needed.
Your support suggested adding...
<TelerikLicensingVerbosity>quiet</TelerikLicensingVerbosity>
...to each project in my solution, but that still produces the above build message.
A polite solution would be to turn-off ALL such warning messages, and let me switch them ON when needed. Preferably via a setting somewhere, not by editing the VS project file, which means unloading, editing the project file, and realoading each of many projects.
(Visual Studio 2026, not currently an option in the drop-down below)
There is a big problem with Telerik controls when using national resource files. Switching from one language to another and again sometimes destroys the user interface. It especially concerns RadCheckBox control. Text, tooltip and probably other properties from one control appear in other control etc. I think it can be a general problem because I also noticed that sometimes Image from one RadButton control appears in other button.
I prepared a set of images which show how it happended in my case. Switching from Default language to Polish language and again and then adding and removing new RadCheckBox completly destroyed user interface in my sample UserControl. This new RadCheckbox was created as a copy of existing RadCheckBox what may be a clue.
I also attached VS2019 project with my sample UserControl.
Best regards,
Andrzej
Team,
we did not get any help from public forums,
we are expecting in 2026Q1,
so please handle it, https://feedback.telerik.com/winforms/1700973-radfiledialogs-selecting-large-number-of-files-is-very-slow
Team,
we did not get any help from public forum,
we are expecting in 2026 Q1,
RadControl: Incorrect Font scaling after DPI switch runtime
team,
we did not get any help from public forum,
already we commited our stack holders will resolve in 2026 Q1, so please close ASAP.
RadFileDialogs: Selecting Large Number of Files is Very Slow
team,
we did not get any help from public forum,
already we commited our stack holders will resolve in 2026 Q1, so please close ASAP.
The content is exported correctly, but the following error occurs:
