Telerik License Not Found Dialog Shown When UI for WPF Used in Addin Project

Environment

Product Version	2025.2.521
Product	UI for WPF

Description

The invalid/missing Telerik license key dialog is shown in addin projects even when a valid license is installed.

Solution

This happens because there is no proper main window and application context, which means that the licensing mechanism cannot get evaluated as epxected. To resolve this, use the TelerikLicensing.Register static method with your license script key, which can be downloaded from the License Keys page.

    public MyWPFUserControl()
    {
        TelerikLicensing.Register("your-script-key");
        InitializeComponent();
    }