Loading the Examples project fails with missing imported TelerikLicensingVersion.targets file.

In this particular scenario, we have 2 monitors. One with 100 % and one with 150% DPI. When the ScreenTip is shown in 100%, its size is correct. Then if we move the Form to the second monitor that is 150%, the screenTip size is not scaled when shown for the first time. We need to move the mouse to hide and show it again. The second time, the size is correct.

When we set a checkbox with the CheckState to Indeterminate, then it's serialized by the designer is that order (because VS serialized in alphabetical order).
But next time we open the form, it's unchecked, because setting to Indeterminate before setting IsThreeState to true is ignored.

Clients with perpetual license may observe the following warning when using UI.for.WinForms.AllControls.Net90 (v.2026.1.415): 

Telerik and Kendo UI Licensing warning TKL403: Services associated with Telerik Document Processing Libraries version 2026.1.402.80 require a subscription or trial license. Please obtain a subscription license at https://prgress.co/3PwQMKZ

Telerik and Kendo UI Licensing warning TKL004: Unable to locate licenses for all products.

Hi, I would like to use the conversion tool to convert a WinForms project to Telerik controls. Unfortunately the menu item is not showing up for me. See attached screenshot. 

The project to be converted does include a reference to System.Windows.Forms. I am using VS2019 with the latest Telerik Winforms release. 

Thanks,

-Lou

Introduce a Converter tool standalone application which does not depend on a specific Visual Studio version.

In the Visual Theme Builder (fresh installed Telerik UI for WinForms) you'll get an error because the directory "VbsRecoveryData" seems to be missing. Creating the directory before "package.Compress(path)" fixes this for me.

 

After upgrading to the latest version of Telerik, whenever I right-click the header row of the child grid in a hierarchy grid (to go to column chooser).

The content is exported correctly, but the following error occurs:

 

NullReferenceException is called during EndUpdate() under heavy Garbage Collector activity

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

Provide an AI assistant for code generation with the Telerik UI for WinForms controls. 

Such as Telerik Blazor AI Coding Assistant

At this moment, DocumenWindow has only Image property.

 Currently, the EnableUIAutomation property can be set per control. It would be useful if there is an opportunity to enable/disable it globally. 

Using specifically Win11 Compact DARK theme has additional space compared to the Win11 Compact LIGHT theme. See the pictures.

• On Light theme there are 4 pixels between the form border and the top border of a tab.
• On Dark theme there are 12 pixels between the form border and the top border of a tab.

In my opinion the dark theme has a wrong height here and the light theme is correct, especially compared to other themes, even Office 2019 for example.

Light theme:

Dark theme:

In this scenario, a new archive is created in code and two files are added to the archive. The archive is protected with a password. When trying to open the file inside and typing the correct password, a message appears with a text that the typed password is incorrect.

Error is received when click on button. Reproduced randomly on different machines.

 Licensing watermark shows on RadForm in the Excel/Word Add-in projects.

Since 2025 Q2 you'll get this error message when you try to open a flyout on a control that is not a Form. This does not happen with 2025 Q1.

Might be related: https://feedback.telerik.com/winforms/1688619-radform-clientsize-on-inherited-radform-is-broken

However, this time I have no patch / workaround. I have not the time to investigage deeper at the moment, so update to Q2 not possible for me at the moment.