Additionally, there is a slight fade animation built-in in the Popup class used by RadMenu. I am afraid this behavior is not customizable as it is built-in.
However, with the upcoming 2012 Q1 release, RadMenu will be updated with a new popup class that does not contain this functionality. You will be able to use the control stripped of any default animations.
I hope this will be helpful.
Kind regards,
Dani
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>