When the WebHtmlEditor creates this collection internally, it provides a reference to the Toolbar web control that is the "parent" of this collection. When items are added/removed to the collection, references to these items are also added/removed to the ASP.NET web control heirarchy. For this reason, it is NOT recommended that you create an object of this type within your code. Simply used the instance already created and initialized, and exposed as the Toolbar.Items property of the Toolbar control.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2