Hi Ruth Goldberg,
Thank you for writing. Actually, there is no way to change the ToolTip for every control without taking into account the RadControl type. You can iterate over all controls and set the ToolTipText, but you will notice that this will not work for every RadControl:
RadItem item = ((RadControl)control).RootElement.Children
You have to do this considering the specific controls that you have used in your form. Write me back if you have any additional questions.
the Telerik team