suite of controls, of which RadToolTip
is a part, is built on top of MS AJAX framework.
The framework has been developed by Microsoft and is "pushing" for using more standards-compliant web pages - such as the default provided by VS 2005 XHTML 1.0 Transitional.
The MS AJAX methods that set position and size are not functioning properly in IE with DOCTYPE HTML 4.0.
We are aware of the problem, and it has been logged as one requiring work around to be developed.
At present there is no workaround available (other than changing the doctype to a more standards-compliant one). Is there any reason for you to keep the old DOCTYPE HTML 4.0?
the Telerik team