ExtenderControlToolboxItem Class
Provides a way to determine which target controls can be extended by a particular extender control in the toolbox.
Assembly: System.Web.Extensions.Design (in System.Web.Extensions.Design.dll)
The GetTargetControlTypes method returns the collection of target types. The collection is cached for performance by using the Properties dictionary.
If you write an extender control that implements IExtenderControl, but that does not derive from ExtenderControl, specify this type in the ToolboxItemAttribute attribute of your control.
System.Drawing.Design::ToolboxItem
System.Web.UI.Design::WebControlToolboxItem
System.Web.UI.Design::ExtenderControlToolboxItem
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.