Last Updated: 14 Apr 2021 15:56 by ADMIN
Release R2 2021
Created on: 30 Mar 2021 20:03
Category: RibbonBar
Type: Bug Report
Error when adding RadDropDownListElement to RadRibbonBarGroup

Hi Telerik Support,

Here is a description of the environment I work with:


- Visual Studio 2019 (version 16.9.3)

- NuGet package is UI.For.Winforms.AllControls.Net50 (v2021.1.326)

- Project is a .NET5.0 class library.


When trying to add a RadDropDownListElement to a RadRibbonBarGroup, Visual Studio seems to encounter an error and a window pops up with the message "The connection to the server has been lost". Adding other types of elements to the RadRibbonBarGroup seems to work properly (I managed to add buttons without any issues).

I will attach a screenshot of the issue.

Thanks for your help !

Attached Files:
1 comment
Dess | Tech Support Engineer, Principal
Posted on: 31 Mar 2021 06:53

Hello, Danny, 

Following the provided information, I was able to replicate the problem you are facing. I confirm that it is an issue with the .NET 5 designer when adding a RadDropDownListElement in the ribbon group.

I have logged it in our feedback portal by making this thread public on your behalf. You can track its progress, subscribe for status changes and add your comments on the following link - feedback item.

I have also updated your Telerik points.

Please excuse us for the inconvenience caused. We will do our best to introduce a fix accordingly.  

Dess | Tech Support Engineer, Sr.
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Attached Files: