Hello Chris,
Thank you for contacting Telerik Support.
Can you please tell me what functionality you want to achieve with such feature, so that I can elaborate more on your use case?
Concerning the "hint" on mouse hover, you can take a look at
this blog post which explains how you can use the DefinitionsManager class to substitute the example text beneath a textbox with text visible upon hovering over the a question mark image.
Greetings,
Boyan Barnev
the Telerik team