Hello guys,

 You are correct that the behavior regarding the separate tooltip and the Alt attribute has been changed. Note, however, that one of the main purposes [among others] of RadToolTip is to be used as a replacement of the "standard browser tooltip". This is the reason that the tooltip, as its highest priority reads the title or alt attribute of the element (as it is the title/alt attribute that causes a browser tooltip to be displayed).

As a result, in fact there are 4 ways to display content in a tooltip - by reading its TargetControl's title attribute, by setting the RadToolTip's Text property, or by writing HTML between the RadToolTip opening and closing tags.

Here is the correct priority for the three approaches to setting the RadToolTip content:

1. RadToolTip Text property
2. [target control] title attribute / ToolTip server property
3. alt attribute/AlternateText server property
4. RadToolTip content between opening/closing tags

Since the tooltip manager used to work like above explained from its creation when autotooltipify is used, we got customers` requests to make this behavior consistent and the same for the separate RadToolTip as well.

Note, that before this when a separate RadToolTip was used the Alt was removed as well - this is needed because under IE6 and IE7 this causes double tooltips - one standard generated from the Alt and one RadToolTip. This being said the only actual change is that the separate tooltip now gets the Alt text as the standard and also as the tooltip manager works. This change is also documented below:

http://www.telerik.com/products/aspnet-ajax/whats-new/release-history/q3-2009-sp2-version-2009-3-1314-2367038387.aspx

What I can suggest to do in order achieve what you need is either not to set the Alt or  to use some simple js code as the one shown below which I prepared for you:

Kind regards,
Svetlina
the Telerik team

Hello dstj,

I am glad to inform you that we decided to implement a new property which will help in controlling the behavior related to the Alt attribute. The new property will be most probably available for the official Q2 2010 release and its default value will be such that the behavior will stay the same as it is now but by setting it explicitly you will be able to avoid removing the Alt.

Greetings,
Svetlina
the Telerik team