Just now installed Telerik for WPF
Opening Visual Studio, creating project Telerik C# WPF Application, selecting "Blank" and "Finish".
Opening MainWindow.xaml, dragging RadRichTextBox from toolbox and dropping into Grid.
But here is Object reference not set in output log. When running - it crashes. Point.
RadButton works correctly.
Result code is here: https://pastebin.com/yVSNDbMH
Visual Studio is 2017
OS is Windows Server 2012
Locale is ru-RU
Telerik Installer is TelerikUIForWpfSetup_2017_3_0814_1.exe
C:\Program Files (x86)\Telerik\UI for WPF R2 2017\Binaries\WPF40\Telerik.Windows.Controls.RichTextBoxUI.dll file version is 2017.2.614.40
If you have different version and haven't problem, please give me installer or just this DLL, I'll try fix or search a bug with .NET Reflector