Can you please make sure that the name of the directory where you have put the RadWindow's RadControls folder matches the exact version and public key token of the control and the files and folders inside it exist (see attached screenshot)? The name of the folder is built like this:
<name of the dll>\<version of the dll>_<publc key token>
e.g. if you are using v1.8.2 and the public key token is a3055f084732468e, the path will be C:\Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\RadWindow.Net2\188.8.131.52_a3055f084732468e
You can check the public key token by opening the C:\Windows\assembly folder, right-clicking on the RadWindow's assembly and selecting Properties (see attached screenshot).
If this doesn't help and you still see the message stating that the CoreTemplates file cannot be found, I would like to ask you to open a new support ticket and send me the following:
- Screenshot of the RadControls\Window folder in your Windows explorer where I can see the full path
- A screenshot of the assembly's properties (like the one attached to this thread)
- Screenshot of your code with the RadWindow's declaration.
the Telerik team