Thank you for writing.
This issue is related to resource loader and our themes.
You can avoid the missing shapes message by creating a new instance of the shapes before loading the themes. Please note that the Telerik.WinControls.UI assembly should be referenced:
Assembly lAssembly = Assembly.GetAssembly(
Please note that this issue is addressed in our latest releases and I would strongly recommend updating your Telerik version. Our latest releases address many issues and introduce many new components and features.
I hope this helps. If you have additional questions, feel free to contact me.
All the best,
the Telerik team