I'm working on a web project that uses Telerik controls. The project was originally created using Visual Studio 2010, and underwent the upgrade to 2012 before I got there.
I recently upgraded to Visual Studio 2013 and for some reason VS2013 doesn't recognize Telerik controls as part of the auto-generation of the designer file.
For example if I added a control to the .aspx page:
<telerik:RadButton ID="rbn1" runat="server"></telerik:RadButton>
The designer.vb file should be auto-generated to contain:
Protected WithEvents rbn1 As Global.Telerik.Web.UI.RadButton
However the designer never auto-adds Telerik controls. Asp and user-defined controls are added as expected. Additionally, my coworkers are using VS2012 and the designer generates correctly, so I don't think it's an issue with Telerik.
We're using the latest version of the Telerik.dll files (2013.3.1114.40). Additionally, I have got it working by removing and re-adding the Telerik.dll references, but it only works until I restart Visual Studio.
This appears to be a similar issue to mine, however Telerik does officially support VS2013. I have also reached out to Telerik directly for support on this issue.