I simply dragged the RadComboBox control from the Toolbox under "Telerik UI for WPF - Input 2020 R3" and dropped it into the designer. This created the entry:
I did nothing else, build and execute project and when this Window comes to load I get a runtime error:
Message=Could not load file or assembly 'Telerik.Windows.Controls, Version=2020.3.1020.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at TreeScapes.MainWindow.InitializeComponent() in D:\Visual Studio Projects\TreeScapes\MainWindow.xaml:line 1
Inner Exception 1:
FileLoadException: Could not load file or assembly 'Telerik.Windows.Controls, Version=2020.3.1020.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
If I remove the <telerik:RadComboBox/> line, execution works.
I must admit, my success rate at using Telerik UI for WPF is pretty low, I've spent many hours researching really basic problems and hoops to jump thru to get things to "sorta" work. I don't know what the object is with Telerik UI for WPF, but as it stands right now, it's NOT improving productivity, just the opposite.
I'm at the point where I'll just go back to using all the default VS 2019 Microsoft controls because they just work. My Telerik renewal is coming up in Nov and I honestly can't justify renewing.