Can't add Telerik controls to a user control

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3/23/2020 12:41:01 PM
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Can't add Telerik controls to a user control

I installed the Telerik controls and they work in the layout.master, but I can't get them to load in a user control.

I created a user control and added it to the feature installation & configurations section.  Adding the user control to a page works, and I can see asp controls like a button and text box.  When I add a Telerik control to the user control, I get this error:

2020-03-23 12:39:23,642 ERROR 127.0.0.1 - en-US - /telerik-test - mojoPortal.Web.UI.CmsPage - failed to load control controls/mycontrols/usercontroltest.ascx 
System.Web.HttpCompileException (0x80004005): C:\inetpub\mysite\controls\mycontrols\usercontroltest.ascx(35): error BC30002: Type 'Telerik.Web.UI.RadButton' is not defined.
   at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath)
   at mojoPortal.Web.UI.CmsPage.LoadPage()

Why would a RadButton work in the layout.master but not a user control?

Also, I tried replacing asp:ScriptManager with telerik:RadScriptManager.  Everything seems to work except that the administration panel on the left side of the page won't open.  

I'm using the deployment files, not the source code.

Thanks for any help!!!