Thank you for writing.
I have managed to reproduce the described behavior. There is an issue with the text measure
when you are trying to escape ampersand character. We are currently researching this in detail. If you do not want to use shortcuts binding you could avoid this behavior by setting UseMnemonic property of TextPrimitive to false:
|TextPrimitive.UseMnemonic = false;
Please, excuse us for the inconvenience. Don't hesitate to contact us if you have other questions.
the Telerik team