Gets or sets the ToolTip for the image that is displayed for the expandable node indicator.
Assembly: System.Web (in System.Web.dll)
Use theproperty to specify a ToolTip for the image. The text that you specify provides Assistive Technology devices with a description of the image that can be used to make the control more accessible.
The value of this property is stored in view state.
The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see LocalizableAttribute and ASP.NET Globalization and Localization.
Available since 2.0